Crossword Genius

After setback, leading bank's less stable (7)

Ross

I believe the answer is:

pottier

'less stable' is the definition.
(potty can mean mad)

'after setback leading bank's' is the wordplay.
'after setback' says the letters should be written backwards.
'leading' becomes 'top'.
'bank' becomes 'tier' (I've seen this before).
'top' reversed gives 'pot'.
'pot'+'tier'='POTTIER'

(Another definition for pottier that I've seen is " more bananas".)

I've seen this clue in The Guardian.
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