Power of fighter hurt, gutted (5)
I believe the answer is:
might
'power' is the definition.
('might' can be a synonym of 'power')
'fighter hurt gutted' is the wordplay.
'fighter' becomes 'mig' (I've seen this in other clues).
'gutted' means to remove the middle letters (to gut something is to remove its insides).
'hurt' with its centre taken out is 'ht'.
'mig'+'ht'='MIGHT'
'of' acts as a link.
(Other definitions for might that I've seen before include "Great power/strength" , "It expresses possibility" , "Strength - could possibly" , "- - and main" , "word expressing possibility" .)