Has the skills in prison (3)
I believe the answer is:
can
I believe this clue is a double definition.
'has the skills' is the first definition.
(is able)
'prison' is the second definition.
(the can is American slang for prison)
'in' acts as a link.
(Other definitions for can that I've seen before include "Metal container for food" , "Cooler" , "May" , "Tin; be able to" , "Vessel" .)