Fights as club finishes off last football game, perhaps (7)
I believe the answer is:
battles
'fights' is the definition.
(battling is a kind of fighting)
'club finishes off last football game perhaps' is the wordplay.
'club' becomes 'bat' (I've seen this before**).
'finishes off' suggests the final letters (take the finishing letters off of the words).
The final letters of 'last football game perhaps' are 'tles'.
'bat'+'tles'='BATTLES'
'as' is the link.
(Other definitions for battles that I've seen before include "Fights, conflicts" , "Lengthy conflicts" , "Military engagements" , "Campaigns" , "Military set pieces" .)