Put in shackles (7)
I believe the answer is:
enslave
'put in shackles' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for enslave that I've seen before include "Save Len (anag.)" , "Take into subjection" , "Subject to servitude" , "Subjugate" , "Reduce to subservience" .)