Crossword Genius

Cheese-making ingredient (6)

Ross

I believe the answer is:

rennet

(Other definitions for rennet that I've seen before include "Substance used in cheese making" , "cheesy setter?" , "Substance curdling milk in cheese-making" , "Tenner (anag.); cheese ingredient" , "A tenner could make milk curdle" .)

I've seen this clue in The Guardian.
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