"Go Set a Watchman" author Harper (3)
I believe the answer is:
lee
'go set a watchman author harper' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lee that I've seen before include "Area sheltered from the wind" , "The sheltered side of something" , "actor" , "Robert E. - - , US hero" , "Bruce ___, martial arts ace" .)