Short-sleeved shirt (4)
I believe the answer is:
polo
'short-sleeved shirt' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for polo that I've seen before include "Mounted game" , "Game - explorer - mint - VW" , "Top" , "Game; Venetian explorer" , "explorer of the thirteenth century" .)