Shot below joint (5)
I believe the answer is:
elbow
'joint' is the definition.
(joint of the body)
'shot below' is the wordplay.
'shot' indicates an anagram.
'below' with letters rearranged gives 'ELBOW'.
(Other definitions for elbow that I've seen before include "Barge" , "Arm joint, more power to it" , "Limb hinge" , "Sort of grease" , "Dismissal?" .)