Crossword Genius

Substance used for curdling milk (6)

Ross

I believe the answer is:

rennet

(Other definitions for rennet that I've seen before include "Cheese curdling agent" , "Dairy product" , "substance used to make cheese" , "Substance curdling milk in cheese-making" , "Cheese-maker's substance" .)

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