Clergyman with parking offence (6)
I believe the answer is:
parson
'clergyman' is the definition.
(I've seen this before)
'with parking offence' is the wordplay.
'with' is a charade indicator (letters next to each other).
'parking' becomes 'p'.
'offence' becomes 'arson' (I've seen this before).
'p' put next to 'arson' is 'PARSON'.
(Other definitions for parson that I've seen before include "service provider" , "Minister of religion" , "Anglican clergyman" , "Rector; clergyman" , "One with benefice" .)