Author Harper ___ (3)
I believe the answer is:
lee
'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 "The sheltered side of something" , "Towards the side away from the wind (naut)" , "Cork river" , "The sheltered side - of Cork's river?" , "Revolutionary general" .)