Mere game? (4)
I believe the answer is:
pool
I believe this clue is a double definition.
'mere' is the first definition.
(I've seen this before)
'game' is the second definition.
(I know that pool is a type of table game)
(Other definitions for pool that I've seen before include "Lido - kitty - ball game" , "Kitty; a billiard game" , "found in watery location" , "game indoors" , "American game like snooker" .)