Immoral gamble absorbing number (4)
I believe the answer is:
bent
'immoral' is the definition.
(bent can mean immoral or corrupt)
'gamble absorbing number' is the wordplay.
'gamble' becomes 'bet' (betting is a kind of gambling).
'absorbing' indicates putting letters inside.
'number' becomes 'n' (n can represent any number).
'bet' going around 'n' is 'BENT'.
(Other definitions for bent that I've seen before include "Dishonest; grass" , "Crooked - penchant" , "Dishonest - inclination" , "Crooked; grass" , "Natural aptitude" .)