Nothing missing from a different part of plant (6)
I believe the answer is:
anther
'part of plant' is the definition.
(I've seen this before)
'nothing missing from a different' is the wordplay.
'nothing' becomes 'o' (looks like zero - 0).
'missing from' is a deletion indicator.
'a different' becomes 'another' (I've seen this before).
'another' with 'o' removed is 'ANTHER'.
(Other definitions for anther that I've seen before include "Part of a plant that contains pollen" , "Pollen-holding part of stamen" , "Pollen container of the flower" , "Pollen-producing part of a flower" , "Pollen-containing flower part found in Tehran" .)