Witness protection for pollen producer is offensive (9)
I believe the answer is:
testament
'witness' is the definition.
(I've seen this before)
'protection for pollen producer is offensive' is the wordplay.
'protection for' is an insertion indicator (some letters go around or protect others).
'pollen producer' becomes 'stamen' (I've seen this before).
'is offensive' becomes 'tet' (Tet Offensive, Vietnam War military campaign).
'stamen' going within 'tet' is 'TESTAMENT'.
(Other definitions for testament that I've seen before include "Witness" , "(Person's) will" , "New and old parts of the Bible" , "Statement about final intentions" , "Statement (anag.)" .)