The snag about the haul? (5)
I believe the answer is:
I believe this is a double definition.
'the snag' is the first definition.
(I've seen this before)
'the haul?' is the second definition.
'about' is the link.
(Other definitions for catch that I've seen before include "Getting round" , "a sort of 22" , "Hidden drawback" , "Desirable husband; unforeseen problem" , "problem being concealed" .)