Computer player is more spirited (5)
I believe the answer is:
gamer
This clue is a double definition.
'computer player' is the first definition.
'more spirited' is the second definition.
('game' can be a synonym of 'spirited')
'is' acts as a link.
(Other definitions for gamer that I've seen before include "player using computer" , "More spirited" , "One plays" , "Keen computer player" , "More handicapped" .)