Across
Sleeping on the streets in support of aristocrat (3,3,3,5)
Worm's bit of good luck (5)
Delighted with next July: it's pants without clothes! (8)
Nice expensive copy inside — not so expensive (7)
Finally, mountain climb is beginning (7)
19d
Where flies are unfair (5,3,4)
St Stephen's lower, discarded greeting (6,3)
Spongy clue for boars? (9)
Capturing part of the city (5)
Cancellation period definite (7)
Grants immunity to plotter, primarily involved in Semtex explosion (7)
In dunce's cap, a delinquent frolic (8)
Premium oil mixed in this? (5)
Finally, Dilys and Victor in a bed, cavorting — perhaps they'll be given a last-minute reprieve (5,2,3,4)
Down
Polar feature (and creature) in present incumbent (6,6)
The curtain rising over a lull in hostilities (5)
Somehow prove it hurts the Queen to conquer (9)
Bather unexpectedly catching cold is a sign of cancer (3,4)
Biannual event is mostly horse and bull (7)
Pledges to serve cereal in hospital? On the contrary! (5)
Should one engage with errand to attend literacy class? (3-6)
Sally sitting around, motionless (7,5)
Thrice adrift? (4,2,3)
Derelict and remote cathedral (5,4)
Young female or male caught up in tangled web (3.4) (7)
See 13
Guest argues regularly as a matter of habit (5)
Call that's mostly fraudulent (5)
Type letters or click words in the clue