Off colour near this joint (7)
I believe the answer is:
knuckle
I believe this clue is a double definition.
'off colour near this' is the first definition.
(near the knuckle means off colour)
'joint' is the second definition.
(knuckle is a kind of joint)
(Other definitions for knuckle that I've seen before include "Hand-joint" , "Bone of the fist" , "A finger-joint" , "Knob at finger joint" , "Finger bone" .)