More than one pastry poet's finishing off – plenty, and then some! (12)

I believe the answer is:

overabundant

'plenty and then some' is the definition.

'more than one pastry poet's finishing off' is the wordplay.
'more than' becomes 'over' (I've seen this before).
'one' becomes 'a'.
'pastry' becomes 'bun'.
'poet' becomes 'dante' (Dante is an example).
'finishing off' means to remove the last letter.
'dante' with its last letter removed is 'dant'.
'over'+'a'+'bun'+'dant'='OVERABUNDANT'

I've seen this clue in The Everyman puzzle in The Observer.

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