Across
1
Relaxing location to sit (7,5)
9
Posh people, in UK slang (5)
20
Mendacious individual (4)
22
Space indicated with a 'P' (7)
24
Arrest conmen (anag) – protest (12)
Down
3
Judas's act of betrayal (4)
5
US-born, London-educated crime writer Raymond ___, d. 1959 (8)
7
Treatment using x-rays, gamma rays or subatomic particles (12)
8
It's meant to be overheard (5,7)
19
Online discussion site (5)