Cuban kleptomaniac cases the joint (5)
I believe the answer is:
ankle
'the joint' is the definition.
(joint of the body)
'cuban kleptomaniac cases' is the wordplay.
'cases' indicates the answer is hidden within the clue.
'ANKLE' can be found hidden inside 'cuban kleptomaniac'.
(Other definitions for ankle that I've seen before include "Narrow part of leg" , "Part of the leg between the foot and the shin" , "Human joint" , "Major joint in lower limb" , "Bone over foot" .)