Put favourable slant on offence involving parking (4)
I believe the answer is:
spin
'put favourable slant' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'offence involving parking' is the wordplay.
'offence' becomes 'sin' (a sin is an offence or transgression).
'involving' indicates putting letters inside.
'parking' becomes 'p' (abbreviation on road signs).
'sin' placed around 'p' is 'SPIN'.
'on' acts as a link.
Can you help me to learn more?
(Other definitions for spin that I've seen before include "Move as a top" , "This dizzy doctor is a publicity agent" , "Revolve quickly" , "Political bias" , "Rotate; ride" .)