Milk curdler
I think it could be either:
'milk curdler' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rennet that I've seen before include "Cheese-maker's substance" , "Dairy compound" , "Cheesemakers use this" , "Tenner (anag.); cheese ingredient" , "Substance used to curdle milk for cheese-making" .)
'milk curdler' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rennin that I've seen before include "Coagulating enzyme that can curdle milk" , "Coagulating enzyme that curdles milk" .)