Spiel about serving tray (7)

I believe the answer is:

platter

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'tray' is the definition.
(thesaurus)

'spiel about serving' is the wordplay.
'spiel' becomes 'patter' (synonyms).
'about' indicates putting letters inside.
'serving' becomes 'l' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'patter' enclosing 'l' is 'PLATTER'.

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(Other definitions for platter that I've seen before include "Charger" , "Salver" , "main course" , "pop record" , "Large flat serving dish" .)

I've seen this clue in The Mirror.

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