Effervesce (4)

I think it could be either:

Which length description are you looking for?:

bubble

'effervesce' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for bubble that I've seen before include "- Car; - gum" , "Globule full of gas" , "Feature of champagne" , "Round, hollow film of liquid" , "Pocket of air" .)

I've seen this clue in the King Feature Syndicate, the L.A. Times Daily, The Guardian, The Times, The Sun and The Telegraph.

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