Crossword Genius

Curdling agent (6)

Ross

I believe the answer is:

rennet

'curdling agent' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for rennet that I've seen before include "Substance used in cheese making" , "cheesy setter?" , "Cheese-maker's substance" , "Cheese-making curdler" , "Cheese curdling agent" .)

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