Clothes worn back-to-front for game (4)
I believe the answer is:
Here is my best explanation:
'game' is the definition.
'clothes worn back-to-front' is the wordplay.
'clothes' becomes 'garb' (garb is a kind of clothes).
'worn back-to-front' says the letters should be written in reverse.
'garb' backwards is 'BRAG'.
'for' is the link.
(Other definitions for brag that I've seen before include "Show off, crow", "Game", "Boast; form of poker", "Boast - card game", "Talk boastfully", "Idle talk", "Card game, like poker", "Shoot a line", "Crow" and "Boast ? card-game".)