Crossword Genius

Herb that makes money (4)

Ross

I believe the answer is:

mint

I'm a little stuck... Click here to teach me more about this clue!

'herb' is the definition.
(I know that mint is a type of herb)

'money' is the wordplay.
I cannot quite see how this works, but
'money' could be 'm' (abbreviation used in economics) and 'm' is found within the answer.
The remaining letters 'int' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'that makes' is the link.

Can you help me to learn more?

(Other definitions for mint that I've seen before include "and 18 Down: Southern US cocktail" , "Aromatic herb - perfect" , "Forge" , "but not used" , "Large sum of money" .)

I've seen this clue in The Daily Express.
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