Game in casserole not quite stewed (8)
I believe the answer is:
lacrosse
'game' is the definition.
(lacrosse is a kind of game)
'casserole not quite stewed' is the wordplay.
'not quite' means to remove the last letter.
'stewed' is an anagram indicator.
'casserole' with its final letter taken away is 'casserol'.
'casserol' is an anagram of 'LACROSSE'.
'in' is the link.
(Other definitions for lacrosse that I've seen before include "Like thirteen of the other clues in the French" , "Game played with netted sticks" , "Game played with nets on sticks" , "Sport played with sticks" , "Ball game using netted stick" .)