Foams out of false bottom in plastic container (6)

I believe the answer is:

bottle

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'container' is the definition.
(bottle is a kind of container)

I don't understand the remainder of the clue.

(Other definitions for bottle that I've seen before include "Container for liquids" , "Jeroboam" , "Glass liquid container or slang courage" , "It keeps drink" , "Glass container or slangy courage" .)

I've seen this clue in the Irish Times.

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