A fighter with love for friend (5)
I believe the answer is:
amigo
'friend' is the definition.
(thesaurus)
'a fighter with love' is the wordplay.
'fighter' becomes 'mig' (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'love' becomes 'o' (In tennis, 'love' means 'zero').
'a'+'mig'+'o'='AMIGO'
'for' acts as a link.
(Other definitions for amigo that I've seen before include "friend abroad" , "Mexican's mate" , "Friend in Spanish-speaking areas" , "Hispanic comrade" , "China (in Spain's view)" .)