Section in bank leasing joint (5)
I believe the answer is:
ankle
'joint' is the definition.
(ankle is a kind of joint)
'section in bank leasing' is the wordplay.
'section' indicates a hidden word.
'ANKLE' can be found hidden inside 'in bank leasing'.
(Other definitions for ankle that I've seen before include "Narrow part of leg" , "Major foot joint" , "Location of the talus" , "Low joint" , "Bone over foot" .)