Crossword Genius

Above the neck - in a glass of beer? (4)

Ross

I believe the answer is:

head

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

'glass of beer?' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see a link between them that I don't see?

'above the neck in a' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
The remaining letters 'hed' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for head that I've seen before include "Froth on beer" , "Source of river, leader" , "Chief; go first" , "Edible part of cabbage" , "Noggin" .)

I've seen this clue in The Globe and Mail.
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