Drink Courage? (4)

I believe the answer is:

neck

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This might be a double definition.

'drink' is the first definition.
(to neck a drink is to drink it quickly)

'courage?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

Can you help me to learn more?

(Other definitions for neck that I've seen before include "Isthmus - audacity" , "Spoon" , "sink" , "A short lead" , "Narrow part of e.g. isthmus" .)

I've seen this clue in The Sun.

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