Crossword Genius

Sour liquid accepted on a recipe? (6)

Ross

I believe the answer is:

alegar

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'sour liquid' is the definition.
(I've seen this in another clue)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for alegar that I've seen before include "Sour beer" , "Sour stuff" , "Malt vinegar" .)

I've seen this clue in The Times and The Sunday Times.
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