Boast about clothes (4)
'clothes' is the definition.
(garb is a kind of clothes)
'boast about' is the wordplay.
'boast' becomes 'brag' (synonyms).
'about' shows that the letters should be reversed in order.
'brag' in reverse letter order is 'GARB'.
(Other definitions for garb that I've seen before include "Clothes to brag about" , "Outfit" , "Dress - clothing" , "Clothe" , "Fashion of dress" .)
'boast' is the definition.
(I know that boast can be written as brag)
'about clothes' is the wordplay.
'about' says the letters should be written backwards.
'clothes' becomes 'garb' (garb is a kind of clothes).
'garb' backwards is 'BRAG'.
(Other definitions for brag that I've seen before include "boast; form of poker" , "Shoot a line" , "Card game - boast" , "Card game, like poker" , "Boast about garb" .)