Money-making herb? (4)

I believe the answer is:

mint

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'money-making herb?' is the definition.
(I've seen this before)

'money-making herb?' is the wordplay.
'money' becomes 'm' (abbreviation used in economics).
'making herb?' becomes 'int' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'm'+'int'='MINT'

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(Other definitions for mint that I've seen before include "Vast sum of money" , "strongroom in treasury" , "Culinary herb" , "Aromatic herb - perfect" , "and 18 Down: Southern US cocktail" .)

I've seen this clue in The Irish Independent.

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