Across
21, islander branded with mark of failure? (7)
Gossip old PM cut short on voting system (7)
Only diaspora where outsiders lost in old kingdom (5)
21, suit-wearing sailor in khazi (9)
I haven't cracked this one yet — but Fifteensquared have:
AB (sailor) in LOO (khazi) all in CASE (suit)
21’s valuation of staff? (10)
I haven't cracked this one yet — but Fifteensquared have:
WAND’S WORTH (valuation of staff)
Belt out – repeatedly for 21? (4)
I haven't cracked this one yet — but Fifteensquared have:
SING repeatedly gives this prison
21’s suspicious behaviour (11)
21, 21 left chained by violent criminal (11)
Pocket or collar? (4)
Pain clear, case of hooligan off getting treatment (6,4)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (getting treatment) of CLEAR H[ooliga]N OFF
Drilling, say, I tear into rocks (9)
I haven't cracked this one yet — but Fifteensquared have:
An anagram (rocks) of I TEAR INTO
Crack like that as it happens, one having split (5)
I haven't cracked this one yet — but Fifteensquared have:
SO (like that) + L[i]VE (as it happens, as with broadcasts) minus i (one)
Pipe like mother installed in her ruin? (3,4)
I haven't cracked this one yet — but Fifteensquared have:
AS (like) MA (mother) in GIN (her ruin) – ‘Mother’s ruin’ is slang for gin
Permanent nurse picking flower (7)
Down
Rules with leg before wicket, say, under review (2-4)
Element in God having broken that is (6)
I haven't cracked this one yet — but Fifteensquared have:
ODIN (god) in I.E. (id est – that is)
Radio star on, stir crazy (10)
I see 21 served up some Mexican food (5)
I haven't cracked this one yet — but Fifteensquared have:
A reversal (served up) of OH (I see) + CAN (more slang for prison)
Having various keys in pockets initially, only a lot for a screw? (9)
I haven't cracked this one yet — but Fifteensquared have:
P[ockets] + an anagram (for a screw – slang for a prison officer) of ONLY A LOT
Some retrogressive yob’s accolade? (4)
Hot resin I left, tipped over (8)
Fire, new work unit is in essence gutted (8)
I haven't cracked this one yet — but Fifteensquared have:
N (new) + ERG (work unit) + IS in E[ssenc]E
Evidently painful climbing in heels on stumbling in Alpine kit (10)
Lapse relating to account (9)
Stretch, and man gets punishment (8)
Legs welcoming pants, most intimately – those? (8)
I haven't cracked this one yet — but Fifteensquared have:
KICKERS (legs) round the middle letter (most intimately) of [pa]N[ts]
Ice in jug? (6)
Sin absent before arrest (6)
Group able to swim freely? (5)
A convict up for party (4)
Type letters or click words in the clue