Crossword Genius

It may come forth with the beer (5)

Ross

I believe the answer is:

froth

I'm a little stuck... Click here to teach me more about this clue!

'the beer' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

'it may come forth' is the wordplay.
'forth' can be anagrammed to 'FROTH'.
Though, I am not sure how the anagram is indicated.

'with' is the link.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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