Crooked disposition (4)
I believe the answer is:
bent
I believe this clue is a double definition.
'crooked' is the first definition.
('bent' can be similar in meaning to 'crooked')
'disposition' is the second definition.
(I've seen this before)
(Other definitions for bent that I've seen before include "Angled; grass" , "Angled or curved" , "Crooked - penchant" , "Not straight" , "Slang for dishonest or crooked" .)