Ugly cut in garment (5)
I believe the answer is:
tunic
'garment' is the definition.
(historical type of garment)
'ugly cut in' is the wordplay.
'ugly' is an anagram indicator (an ugly or wrong form of the letters).
'cut'+'in'='cutin'
'cutin' with letters rearranged gives 'TUNIC'.
(Other definitions for tunic that I've seen before include "Close fitting jacket as part of uniform" , "Partly uniform" , "Jacket of some soldiers" , "Loose-fitting shirt or cloak" , "School garment" .)