Crossword Genius

Cleans up Manila’s fringes? Poorly mistaken (5,1,4)

Ross

I believe the answer is:

makes a mint

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

'cleans up manila's fringes? poorly' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'mistaken' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'mistaken' is 'kesamint' which is located in the answer.
The remaining letters 'ma' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in the Sydney Morning Herald.
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