A minor drawback (4)
I believe the answer is:
ward
I believe this clue is a double definition.
'a minor' is the first definition.
(I've seen this in other clues)
'drawback' is the second definition.
(I've seen this in other clues)
(Other definitions for ward that I've seen before include "Hospital unit" , "Division of borough" , "Minor in the charge of a guardian" , "Local administrative district" , "zone for votes" .)