Effervesce (6)

I believe the answer is:

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 "Hollow globule of gas" , "See 13" , "Glass or plastic dome" , "Air surrounded by liquid" , "Liquid gas-filled sphere" .)

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

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