Delight consumes confident Barbarian in game (8,4)
I believe the answer is:
treasure hunt
'game' is the definition.
(I know that treasure hunt is a type of game)
'delight consumes confident barbarian' is the wordplay.
'delight' becomes 'treat' (I've seen this in another clue).
'consumes' means one lot of letters goes inside another.
'confident' becomes 'sure' (similar in meaning).
'barbarian' becomes 'hun' (as in Atilla the Hun).
'sure'+'hun'='surehun'
'treat' going around 'surehun' is 'TREASURE HUNT'.
'in' is the link.
(Other definitions for treasure hunt that I've seen before include "Search for stored wealth" , "possible rally activity" , "Game where players try to find things by following a series of clues" , "Organised search for hidden goodies" , "Game with solving successive clues" .)