Dress worn by footballers for big game trip (6)
I believe the answer is:
safari
'big game trip' is the definition.
(I've seen this before)
'dress worn by footballers' is the wordplay.
'dress' becomes 'sari' (sari is a kind of dress**).
'worn by' indicates putting letters inside (I've seen this in other clues).
'footballers' becomes 'fa' (Football Association abbreviation).
'sari' going around 'fa' is 'SAFARI'.
'for' acts as a link.
(Other definitions for safari that I've seen before include "Animal expedition" , "Hunting journey" , "Hunting expedition (in Africa)" , "African hunting expeiditon" , "Expedition to look at wildlife" .)