Harper who wrote "Go Set a Watchman" (3)
I believe the answer is:
lee
'harper who wrote go set a watchman' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lee that I've seen before include "Confederate general" , "Robert E. - - , US hero" , "Bruce ___, martial arts ace" , "Towards the side away from the wind (naut)" , "Shelter" .)