Joint carved below? (5)
I believe the answer is:
'joint' is the definition.
(elbow joint is a kind of joint)
'carved below?' is the wordplay.
'carved' indicates an anagram.
'below' with letters rearranged gives 'ELBOW'.
(Other definitions for elbow that I've seen before include "Sharp bend in a road or river", "Dismissal?", "Reject", "Nudging joint?", "Below (anag.)".)