Sour condiment (7)

I believe the answer is:

vinegar

'sour condiment' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for vinegar that I've seen before include "Pickling medium" , "Liquid used as condiment or food preservative" , "Ill-temper" , "Pickling agent" , "Sour liquid used as condiment" .)

I've seen this clue in The Mirror and The Irish Times.

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