Crossword Genius

What might be made by sexually available brass? (4,5)

Ross

I believe the answer is:

easy money

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

'brass?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'what might be made by sexually available' is the wordplay.
I cannot really understand how this works, but
'available' could be 'on' (I've seen this in other clues) and 'on' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for easy money that I've seen before include "Cash obtained with little effort" , "effortless gain" , "Can one get this for jam" , "Good pay for little work" , "scam" .)

I've seen this clue in The Independent.
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