Returned garments displaying blemish (4)
I believe the answer is:
spot
'blemish' is the definition.
(I know that spot is a type of blemish)
'returned garments' is the wordplay.
'returned' says the letters should be written in reverse.
'garments' becomes 'tops' (top is a kind of garment).
'tops' reversed gives 'SPOT'.
'displaying' is the link.
(Other definitions for spot that I've seen before include "Notice; skin blemish" , "Informally, catch sight of" , "Small mark or stain" , "moral flaw" , "Discern - mark" .)