Crossword Genius

It can be blown from a pipe (6)

Ross

I believe the answer is:

bubble

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'pipe' is the definition.
(thesaurus)

I don't understand how the remainder of the clue works.

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(Other definitions for bubble that I've seen before include "Boil" , "Globule full of gas" , "Blister" , "Hollow globule of gas" , "Thin ball of liquid enclosing air or gas" .)

I've seen this clue in the Evening Standard.
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