Suds, froth (4)

I believe the answer is:

foam

This clue is a double definition.

'suds' is the first definition.
(synonyms)

'froth' is the second definition.
(synonyms)

(Other definitions for foam that I've seen before include "Suds" , "Fizz, froth" , "Mass of small bubbles" , "Boiling bubbles" , "Suspension of gas in a liquid" .)

I've seen this clue in The Times.

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