Crossword Genius

Some cash brought up for cheesemaker's ingredient (6)

Ross

I believe the answer is:

rennet

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'cheesemaker's ingredient' is the definition.
I can't tell whether this definition defines the answer.

'some cash brought up' is the wordplay.
'some cash' becomes 'tenner' (slang for UK ten pound note).
'brought up' shows that the letters should be reversed in order (in a down clue, letters go up).
'tenner' in reverse letter order is 'RENNET'.

'for' is the link.

Can you help me to learn more?

(Other definitions for rennet that I've seen before include "Cheese-maker's substance" , "Substance used to curdle milk for cheese-making" , "Cheese-making curdler" , "Preparation for curdling milk" , "Substance that curdles milk" .)

I've seen this clue in The Times.
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