Local head - a bit boozy (5)

I believe the answer is:

froth

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'local head' is the definition.
'froth' can be an answer for 'head' (thesaurus). I am not sure about the 'local' bit.

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

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" .)

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