Oscar exercises with judge after work (7)
I believe the answer is:
operate
'work' is the definition.
(I know that work is a kind of operate)
'oscar exercises with judge' is the wordplay.
'oscar' becomes 'O' (phonetic alphabet: alpha, bravo, charlie etc.).
'exercises' becomes 'pe' (Physical Education class).
'with' is a charade indicator (letters next to each other).
'judge' becomes 'rate' (rating is a kind of judging).
'o'+'pe'+'rate'='OPERATE'
'after' is the link.
(Other definitions for operate that I've seen before include "Eat rope (anag.)" , "Manage, run" , "Make to work" , "Work as a surgeon" , "Work, run" .)