Harvester back to collect bits of produce everywhere (6)
I believe the answer is:
reaper
'harvester' is the definition.
(I know that harvester can be written as reaper)
'back to collect bits of produce everywhere' is the wordplay.
'back' becomes 'rear' (something's rear is its back).
'to collect' is an insertion indicator (inserted letters are collected by others).
'bits of' suggests taking the first letters.
The initial letters of 'produce everywhere' is 'pe'.
'rear' placed around 'pe' is 'REAPER'.
(Other definitions for reaper that I've seen before include "One who cuts grain as harvest" , "Harvester - death is a grim one" , "Wordsworth's was Solitary" , "Farm worker" , "Farmworker" .)