Insect on female part of flower (6)
I believe the answer is:
anther
'part of flower' is the definition.
('anther' is part of 'flower')
'insect on female' is the wordplay.
'insect' becomes 'ant' (ant is a kind of insect).
'on' is a charade indicator (letters next to each other) (in a down clue, letters appear on others).
'female' becomes 'her' (I've seen this before).
'ant'+'her'='ANTHER'
(Other definitions for anther that I've seen before include "Ran the pollen into it" , "Pollen-holding part of stamen" , "(Actors) leave stage" , "produces pollen" , "Pollen-containing flower part found in Tehran" .)