"To Kill a Mockingbird" girl (5)
I believe the answer is:
scout
'to kill a mockingbird girl' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for scout that I've seen before include "Member of a youth movement" , "Member of organisation for boys" , "One on a recce mission" , "Person on the lookout" , "Soldier on a reconnaissance mission" .)