Dress is concerning, held in disgust (7)
I believe the answer is:
apparel
'dress' is the definition.
(I've seen this before)
'concerning held in disgust' is the wordplay.
'concerning' becomes 're'.
'held in' is an insertion indicator.
'disgust' becomes 'appal' (appalling is a kind of disgusting).
're' put into 'appal' is 'APPAREL'.
'is' acts as a link.
(Other definitions for apparel that I've seen before include "Attire" , "Pod of peas" , "Real pap (anag) - clothing" , "Clothes - garments" , "Garb, clothes" .)