Cornucopia, a pastry affair (9)

I believe the answer is:

abundance

'cornucopia' is the definition.
(thesaurus)

'a pastry affair' is the wordplay.
'pastry' becomes 'bun'.
'affair' becomes 'dance' (both can mean a social gathering).
'a'+'bun'+'dance'='ABUNDANCE'

(Other definitions for abundance that I've seen before include "Plentiful supply" , "Plethora" , "Danube can flow with plenty" , "State of plenty" , "Ban due can be plenty" .)

I've seen this clue in The Guardian.

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