Staple Western character nursing leg when shot (10)
I believe the answer is:
gunslinger
'staple western character' is the definition.
(western films often feature gunslingers)
'nursing leg when shot' is the wordplay.
'when shot' indicates an anagram (letters shot or scattered).
'nursing'+'leg'='nursingleg'
'nursingleg' is an anagram of 'GUNSLINGER'.
(Other definitions for gunslinger that I've seen before include "shot by him?" , "One with a hand weapon" , "user of weapon" , "Armed bandit" , "Fighter" .)