Sour liquid (7)

I think it could be either:

Which length description are you looking for?:

vinegar

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

This is all the clue.

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

I've seen this clue in the Evening Standard, The Guardian and The Telegraph.

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