Crossword Genius

Becomes upset about what's left in the bank (12)

Ross

I believe the answer is:

overbalances

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'in the bank' is the definition.
I can't judge whether this defines the answer.

'becomes upset about what's left' is the wordplay.
'becomes upset' becomes 'balances' (I am not sure about this - if you are sure you should believe this answer much more).
'about' means one lot of letters go next to another.
'what's left' becomes 'over' (I've seen this before).
'balances' put after 'over' is 'OVERBALANCES'.

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I've seen this clue in The Globe and Mail.
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