Discount housing for criminal (9)
I believe the answer is:
reprobate
'criminal' is the definition.
(I've seen this before)
'discount housing for' is the wordplay.
'discount' becomes 'rebate' (rebating is a kind of discounting).
'housing' indicates putting letters inside.
'for' becomes 'pro' (I've seen this before).
'rebate' going around 'pro' is 'REPROBATE'.
(Other definitions for reprobate that I've seen before include "Miscreant" , "Person without moral scruples" , "One who lacks principles" , "baddie" , "Be a porter for an unprincipled person" .)