One gathering harvest in fall? (7)
I believe the answer is:
cropper
This clue is a double definition.
'one gathering harvest' is the first definition.
(someone gathering a crop)
'fall?' is the second definition.
(I have seen 'Heavy fall' mean 'cropper' so perhaps 'fall' could also mean 'cropper')
'in' acts as a link.
(Other definitions for cropper that I've seen before include "Heavy fall" , "failure" , "Come a --, suffer disaster" , "Disastrous mistake or fall" .)