One bent on boozing? (5)

I believe the answer is:

elbow

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'one bent on boozing?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

This is all the clue.

Can you help me to learn more?

(Other definitions for elbow that I've seen before include "Hinged joint" , "Limb hinge" , "sack?" , "Nudge" , "sharp turn" .)

I've seen this clue in the Evening Standard.

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