Make out bottle just below the head (4)

I believe the answer is:

neck

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'make out' is the definition.
(I know that make out can be written as neck)

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

Can you help me to learn more?

(Other definitions for neck that I've seen before include "Isthmus - audacity" , "a bit of bottle" , "Pet" , "Deeply involved, up to this" , "Narrow part of body" .)

I've seen this clue in The Irish Times.

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