Will outer edges of the plant's reproductive organ rot in the end? (9)
I believe the answer is:
testament
'will' is the definition.
(synonyms)
'outer edges of the plant's reproductive organ rot in the end?' is the wordplay.
'outer' is an anagram indicator (I've seen 'out of' mean this).
'edges of' says to take the final letters (I've seen 'edge of' mean this (one of the letters on the edge of the word)).
'reproductive organ' becomes 'stamen' (plant organ).
'in the end?' indicates one should take the final letters (I've seen 'in the end' mean this).
The final letters of 'the plant' are 'et'.
The final letter of 'rot' is 't'.
'et' with letters rearranged gives 'te'.
'te'+'stamen'+'t'='TESTAMENT'
(Other definitions for testament that I've seen before include "evidence" , "Will - covenant" , "New and old parts of the Bible" , "with 1a [NEW] where is Mark?" , "Tribute" .)