Crossword Genius

What's left of cash after my leaving United (3)

Ross

I believe the answer is:

one

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

'united' is the definition.
(as in a phrase like 'we are one')

'what's left of cash after my' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is located in the answer.
The remaining letters 'ne' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'leaving' acts as a link.

Can you help me to learn more?

(Other definitions for one that I've seen before include "Unity" , "SECOND PART OF 16" , "This is singular" , "Lowest cardinal number" , "both halves" .)

I've seen this clue in The Guardian.
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