It can come forth when a pint is pulled (5)

I believe the answer is:

froth

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

'come forth when a pint is pulled' is the wordplay.
'forth' anagrams to 'FROTH'.
However, I am unsure how this is indicated.

'can' is the link.

Can you help me to learn more?

(Other definitions for froth that I've seen before include "Lather" , "Mass of small bubbles" , "Effervesce" , "Small bubbles on a liquid" , "Spume or foam" .)

I've seen this clue in the Evening Standard.

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