Joint seen kicking, partially pulled back (4)
I believe the answer is:
knee
'joint' is the definition.
(knee is a kind of joint)
'seen kicking partially pulled back' is the wordplay.
'partially' indicates the answer is hidden within the clue.
'pulled back' says the letters should be written backwards.
'eenk' is hidden within 'seen kicking'.
'eenk' backwards is 'KNEE'.
(Other definitions for knee that I've seen before include "one is bent on submission" , "proposal might be made on one" , "Human joint" , "Thigh/shin connector" , "for going on begging" .)