Knight in punt leaning (4)
I believe the answer is:
bent
'leaning' is the definition.
(I know that leaning can be written as bent)
'knight in punt' is the wordplay.
'knight' becomes 'N' (chess abbreviation).
'in' indicates putting letters inside.
'punt' becomes 'bet' (I've seen this in other clues).
'n' placed into 'bet' is 'BENT'.
(Other definitions for bent that I've seen before include "passion" , "leaning" , "Twisted or crooked" , "on the fiddle" , "Personal inclination" .)