Clue to minor problem (8)
I believe the answer is:
drawback
'problem' is the definition.
(a drawback is a problem or fault)
I don't understand how the remainder of the clue works.
(Other definitions for drawback that I've seen before include "Limitation, disadvantage" , "Fly in the ointment" , "Obstacle" , "Snag" , "Disadvantage, problem" .)