Hitch, reversal (7)
I believe the answer is:
setback
I believe this clue is a double definition.
'hitch' is the first definition.
(I've seen this before)
'reversal' is the second definition.
(I know that reversal can be written as setback)
(Other definitions for setback that I've seen before include "Hitch" , "Problem" , "Reverse" , "Snag" , "unfortunate event" .)