This crossword No. 26974 clues and answers were published on Sat 27 Aug 2016 and the puzzle can be visited by following The Guardian Prize Crossword No. 26974 link.
All Across Clues and Answers:
10-across – Clan’s rodent making no noise. God! : MACDERMOT
12-across – See 10 : ODIN
13-across – Orator’s reserve during some of croquet game, imprisoned by one Greek king : CICERO
15-across – See 13 : AGAMEMNON
16-across – Piano pieces bring endless pain to young girl’s condition, say : GYMNOPEDIES
17-across – See 16 : STATE
18-across – Supplements men on strike backing silver tree fern : PIECESOUT
19-across – See 18 : PONGA
20-across – ’70s US comedy show with two French articles about Yale’s farm manager : LAUGHIN
21-across – See 20 : ALFRAMSEY
26-across – Gangster in America evades the masses and boasts about derring-do, for starters : CAPONE
28-across – See 26 : CROWDS
30-across – Censures US porters having poison at police station docked : REDCAPS
32-across – See 30 : TANGHIN
34-across – Reserve copper in Germany, half-cut, takes lid off cylinders damaging Spenser’s coffer : BACKUP
36-across – See 34 : SCRYNE
39-across – Tory Lord, wildly errant, having sets of 12 Ford models : TREFGARNE
41-across – See 39 : ZODIACS
47-across – Foreign pupil’s name left off team falling asleep on channel : ELEVE
48-across – See 47 : SOMNOLENT
49-across – Counterfeit note at college having US summer review of European gallery : FALSE
50-across – See 49 : RIJKSMUSEUM
51-across – Out at night, cannot lure out top escapee leaving swindler in gaol : NOCTURNAL
52-across – See 51 : CONMAN
53-across – End of autumn shock — leaves unfold on 60% of roses, fenced off : STUN
54-across – See 53 : FRONDESCE
All Down Clues and Answers:
1-down – My admission to being out of date causes stalemate around a neat ancient Iranian city : IMPASSE
2-down – See 1 : ECBATANA
3-down – Tops of elms growing in vivid green high Austrian alpine valley dwarfed 10 dead, swaying : DEFEREGGEN
4-down – See 3 : STUNTED
5-down – Poet’s lines about being only cut on poor ’40s/’50s movies — could be Rififi and not If … : LONGFELLOW
6-down – See 5 : FILMNOIR
7-down – Extra drapes ordered across a broad area by truculent single worker : WIDESPREAD
8-down – See 7 : DEFIANT
9-down – Institution with bad smell upset the French doctor and farceur — it’s a French retail chain : BORSTAL
11-down – See 9 : MONOPRIX
14-down – Fashion merchants are those who show promise having sculpted tails : COSTUMERS
22-down – See 14 : SCUTS
23-down – Dismal Eisteddfod winner turned up uncertain at end of speech : DRAB
24-down – See 23 : HAZY
25-down – Flower having a virtually unrelenting smell. Good! : ASTER
27-down – See 25 : PONG
29-down – Black butt extinguishes powdered tobacco like this, note : STUB
31-down – See 29 : SNUFFSOUT
33-down – Store has in frilly hydrangeas but is unable to arrange 10 in temporary quarters : HORTENSIAS
35-down – See 33 : CANTONMENT
37-down – Valerie Le Vaillant has to scold independent union leader, having entered the Co-ops drunk for unwanted effect : CHIEFGUIDE
38-down – See 37 : POSTECHO
40-down – Supports male during stoppages with quiet cuddle. That’s not right! : ARMRESTS
42-down – See 40 : CALMNESS
43-down – To remove a priest is an obstacle to one judge living around capital : DEFROCK
44-down – See 43 : BEIJING
45-down – Waved goodbye, having repelled an intruder nourished at spa : SEENOFF
46-down – See 45 : WELLFED
This crossword has in total 54 where 26 are across and 28 are down.