Drinking bender has bowel in knots! (5)
I believe the answer is:
elbow
'drinking bender' is the definition.
'elbow' can be an answer for 'bender' (something which bends). I'm not certain of the 'drinking' bit.
'bowel in knots' is the wordplay.
'in knots' indicates an anagram (I've seen this in other clues).
'bowel' anagrammed gives 'ELBOW'.
'has' is the link.
Can you help me to learn more?
(Other definitions for elbow that I've seen before include "Jostle" , "Limb hinge" , "sack?" , "Below (anag.)" , "part of the body" .)