Milk-curdling agent utilised in cheesemaking (6)

I believe the answer is:

rennet

(Other definitions for rennet that I've seen before include "Tenner (anag.); cheese ingredient" , "Cheesemakers use this" , "Preparation for curdling milk" , "Agent for cheesemaker" , "Curdler of milk" .)

I've seen this clue in The Times.

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