Champagne ingredient unsuitable for vegetarians (3)

I believe the answer is:

ham

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'champagne ingredient unsuitable for vegetarians' is the definition.
I can't judge whether this defines the answer.

'champagne ingredient' is the wordplay.
'ingredient' indicates a hidden word (I've seen 'ingredient of' mean this).
'HAM' is hidden within 'champagne'.

Can you help me to learn more?

(Other definitions for ham that I've seen before include "An actor who overdoes it in meaty way" , "(Cooked or cured) thigh of pig" , "Gammon" , "Bad actor; Noah son" , "Tasty meat for thespian who overacts" .)

I've seen this clue in the Evening Standard.

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