Chains, shackles (7)
I believe the answer is:
I believe this clue is a double definition.
'chains' is the first definition.
(I've seen this in another clue)
'shackles' is the second definition.
(I know this)
(Other definitions for fetters that I've seen before include "Restrictions" , "Irons, chains" , "Bonds" , "Chains - shackles" .)