Cool joint (3)

I believe the answer is:

hip

This clue is a double definition.

'cool' is the first definition.

'joint' is the second definition.
(hip is a kind of joint)

(Other definitions for hip that I've seen before include "Swinging" , "Following trends" , "Cool < fruit" , "Pelvis" , "flask here?" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app