Crossword Genius

Flag a recipe containing a thickener (4)

Ross

I believe the answer is:

agar

'a thickener' is the definition.
(I've seen this in another clue)

'flag a recipe containing' is the wordplay.
'containing' says the answer is hidden in the clue.
'AGAR' is hidden within 'flag a recipe'.

(Other definitions for agar that I've seen before include "Food-thickening jelly" , "part of culture?" , "Jelly medium" , "Jelly got from seaweeds, used in foods" , "Food thickening agent obtained from seaweed" .)

I've seen this clue in The Daily Express.
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