Unfortunate cut in garment (5)
I believe the answer is:
tunic
'garment' is the definition.
(tunic is a kind of garment)
'unfortunate cut in' is the wordplay.
'unfortunate' is an anagram indicator.
'cut'+'in'='cutin'
'cutin' with letters rearranged gives 'TUNIC'.
(Other definitions for tunic that I've seen before include "Roman garment" , "Loose-fitting shirt or cloak" , "(Policeman's) jacket" , "Loose fitting light cloak extending to the hip or lower" , "Policeman may be in one" .)