Crossword Genius

Poly ending (5)

Ross

I believe the answer is:

ester

'poly ending' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ester that I've seen before include "radical" , "Chemical compound of acid and alcohol, found in trees" , "Reset (anag.)" , "Compound; trees (anag.)" , "Organic compound, rhymes with court joker" .)

I've seen this clue in the Penny Press.
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