Bad luck loves to follow gangster (6)
I believe the answer is:
hoodoo
'bad luck' is the definition.
(I've seen this before)
'loves to follow gangster' is the wordplay.
'loves' becomes 'oo'.
'to follow' says to put letters next to each other.
'gangster' becomes 'hood' (I've seen this before).
'oo' put after 'hood' is 'HOODOO'.
(Other definitions for hoodoo that I've seen before include "Witchcraft" , "Thing or person that brings bad luck" , "Jinx" , "Thing or person thought to cause bad luck" , "Fetish - charm with magical powers" .)