Problem for couple (5)
I believe the answer is:
hitch
This clue is a double definition.
'problem' is the first definition.
(I've seen this before)
'couple' is the second definition.
(thesaurus)
'for' is the link.
(Other definitions for hitch that I've seen before include "Snag - free ride" , "Hindrance" , "To travel without paying" , "Snag; tie up (animal)" , "something uplifting" .)