Second piece of pollen removed from another part of stamen (6)
I believe the answer is:
anther
'part of stamen' is the definition.
('anther' is part of 'stamen')
I don't understand how the remainder of the clue works.
(Other definitions for anther that I've seen before include "produces pollen" , "Pollen part of flower" , "Pollen-producing part of a flower" , "Pollen-holding part of stamen" , "Part of a plant that contains pollen" .)