Adding pepper would give flavour - that's where money is made! (4)

I believe the answer is:

mint

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'where money is made' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

(Other definitions for mint that I've seen before include "Coinage producer" , "Large sum of money" , "Place authorised to make a country's coins" , "Forge" , "Building where coin money is made (4)" .)

I've seen this clue in The Irish News.

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