Leg tendon (9)
I believe the answer is:
hamstring
'leg tendon' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for hamstring that I've seen before include "Impede" , "Tendon behind the knee" , "hamper" , "Cramp the style of" , "Tendons at back of the knee" .)