Policeman favoured parking within division (9)
I believe the answer is:
inspector
'policeman' is the definition.
(inspector is a kind of policeman)
'favoured parking within division' is the wordplay.
'favoured' becomes 'in' (I've seen this in other clues).
'parking' becomes 'p'.
'within' means one lot of letters goes inside another.
'division' becomes 'sector' (I've seen this before**).
'p' placed within 'sector' is 'spector'.
'in'+'spector'='INSPECTOR'
(Other definitions for inspector that I've seen before include "Policeman; compliance official" , "one to check" , "senior cop" , "I look over" , "controller" .)