Prison also has outlaw (7)
I believe the answer is:
brigand
'outlaw' is the definition.
(I know that brigand is a type of thief)
'prison also' is the wordplay.
'prison' becomes 'brig' (I've seen this before).
'also' becomes 'and' (both can mean in addition).
'brig'+'and'='BRIGAND'
'has' is the link.
(Other definitions for brigand that I've seen before include "Gang member" , "Bandit" , "Plunderer" , "Pirate" , "Robber - darn big (anag)" .)