Crossword Genius

One bent on drinking pints of beer? (5)

Ross

I believe the answer is:

elbow

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

This might be a double definition.

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

'pints of beer?' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

Can you help me to learn more?

(Other definitions for elbow that I've seen before include "given to one about to leave" , "Major arm joint" , "Limb hinge" , "sharp turn" , "Hinged joint" .)

I've seen this clue in The Sun.
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