Hitch, problem (4)
I believe the answer is:
snag
This clue is a double definition.
'hitch' is the first definition.
(I know that snag is a kind of hitch)
'problem' is the second definition.
(snag can mean a problem or difficulty)
(Other definitions for snag that I've seen before include "Unexpected difficulty" , "Disadvantage - small hole in fabric" , "Hitch, unexpected problem" , "Jagged projection" , "A hidden obstruction" .)