Prison officer in need of a driver? (5)
I believe the answer is:
screw
This clue is a double definition.
'prison officer' is the first definition.
(slang term)
'a driver?' is the second definition.
(thesaurus)
'in need of' acts as a link.
(Other definitions for screw that I've seen before include "Tapered fastener with a slotted head" , "Apply backspin (snooker)" , "Archimedes' invention" , "Hack" , "something with thread" .)