A joint in the bowel? (5)

I believe the answer is:

elbow

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

'a joint' is the definition.
(joint of the body)

'the bowel?' is the wordplay.
'bowel' can be anagrammed to 'ELBOW'.
But, I am not sure how the anagram is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for elbow that I've seen before include "Arm joint, more power to it" , "Major arm joint" , "Nudge" , "Hinge joint" , "Barge" .)

I've seen this clue in the Evening Standard.

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