Lucifer may be here, game to fight (8)
I believe the answer is:
matchbox
'lucifer may be here' is the definition.
(lucifer is a type of match)
'game to fight' is the wordplay.
'game' becomes 'match' (I've seen this before).
'to fight' becomes 'box' (boxing is a kind of fighting).
'match'+'box'='MATCHBOX'
(Other definitions for matchbox that I've seen before include "that has inflammable contents?" , "This will hold your vestas" , "Small" , "Container for lighters" , "in which strikers are contained" .)