22 down
Snooping
on
revolutionary
agreed
in
retrospect
(5)
Snooping on revolutionary agreed in retrospect (5)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
Look at Snooping — that's your definition, meaning prying. Now for the wordplay: reverse ON ("revolutionary") to get NO, then take YES for "agreed" and flip that too ("in retrospect") to get SEY, and the two bits come together to give you the full answer.