What' s left is maybe bust (4)

I believe the answer is:

stub

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'what' s left' is the definition.
I can't tell whether this definition defines the answer.

'maybe bust' is the wordplay.
'maybe' indicates an anagram.
'bust' is an anagram of 'STUB'.

'is' is the link.

Can you help me to learn more?

(Other definitions for stub that I've seen before include "Wee bit of pencil, eg," , "Tooth remnant" , "Knock (e.g. toe)" , "Short end" , "Counterfoil, of a cheque say" .)

I've seen this clue in the Evening Standard.

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