Got back a Roman garment (4)
I believe the answer is:
toga
'roman garment' is the definition.
(I've seen this in another clue)
'got back a' is the wordplay.
'back' shows that the letters should be reversed in order.
'got' reversed gives 'tog'.
'tog'+'a'='TOGA'
(Other definitions for toga that I've seen before include "Roman dress" , "Cloak of ancient Rome" , "Garment worn by men in ancient Rome" , "Roman raiment" , "garment of old" .)