Gladiator fights nursing a cut, amazingly (9)
I believe the answer is:
spartacus
'gladiator' is the definition.
(I know this)
'fights nursing a cut amazingly' is the wordplay.
'fights' becomes 'spars' (sparring is a kind of fighting).
'nursing' indicates putting letters inside.
'amazingly' indicates an anagram.
'a'+'cut'='acut'
'acut' is an anagram of 'tacu'.
'spars' enclosing 'tacu' is 'SPARTACUS'.
(Other definitions for spartacus that I've seen before include "Roman revolutionary" , "Famous gladiator who led revolt against Rome" , "Roman gladiator who led slaves in revolt" , "Roman slave who led an uprising against Roman legions" , "Old fighter" .)