. . . joint: some shank left (5)
I believe the answer is:
ankle
'joint' is the definition.
(ankle is a kind of joint)
'some shank left' is the wordplay.
'some' indicates a hidden word (some of the parts of the word are used).
'ANKLE' can be found hidden inside 'shank left'.
(Other definitions for ankle that I've seen before include "Narrow part of leg" , "Lower leg joint" , "Major foot joint" , "Low joint" , "Foot-leg connector" .)