Extract of benzene's tertiary compound (5)

I believe the answer is:

ester

'compound' is the definition.
(ester is a kind of compound)

'extract of benzene's tertiary' is the wordplay.
'extract of' indicates the answer is hidden within the clue (I've seen this in other clues).
'ESTER' is hidden within 'benzenes tertiary'.

(Other definitions for ester that I've seen before include "radical" , "Reset (anag.)" , "Organic chemical compound" , "Fat" , "Organic compound, rhymes with court joker" .)

I've seen this clue in The Independent.

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