Shackled (8)
I believe the answer is:
tethered
'shackled' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for tethered that I've seen before include "Bound" , "Of animal, with rope fastened to prevent straying" , "Tied to something with a rope" , "Tied (animals) up" , "Of animal, secured or hobbled" .)