Crowd harvesting (9)
I believe the answer is:
gathering
I believe this clue is a double definition.
'crowd' is the first definition.
(a crowd of people)
'harvesting' is the second definition.
(I've seen this before)
(Other definitions for gathering that I've seen before include "Sewing" , "convention?" , "Understanding - crowd" , "Assembly, meeting" , "bee" .)