One bent on drinking? (5)
I believe the answer is:
elbow
'one bent on drinking?' is the definition.
Although both the answer and definition are singular nouns, I don't understand 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 "Jostle" , "Nudge" , "Hinged joint" , "Major arm joint" , "Sharp bend in a road or river" .)