He brings a quick end to the wild deer (5)
I believe the answer is:
derek
'he' is the definition.
'a quick end to the wild deer' is the wordplay.
'end' says to take the final letters.
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'the wild' is an anagram indicator.
The final letter of 'quick' is 'k'.
'deer' with letters rearranged gives 'dere'.
'k' put after 'dere' is 'DEREK'.
'brings' acts as a link.
(Other definitions for derek that I've seen before include "Sir - - Jacobi (actor)" , "- and the Dominos was Eric Clapton's band" , "Fellow" , "Man's name" .)