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 understand how this works, but
'money' could be 'm' (abbreviation used in economics) and 'm' is located in 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' acts as a 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 and The Mirror.
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