Country game's moment finishing early (6)
I believe the answer is:
rustic
'country' is the definition.
(I've seen this in another clue)
'game's moment finishing early' is the wordplay.
'game's' becomes 'RU's' (rugby union).
'moment' becomes 'tick' (both can mean a very short amount of time).
'finishing early' means to remove the last letter (the word finishes earlier than normal).
'tick' with its final letter removed is 'tic'.
'rus'+'tic'='RUSTIC'
(Other definitions for rustic that I've seen before include "Countryfied" , "Rural - simple" , "Relating to the countryside" , "country cousin" , "Characteristic of country life" .)