Put on a leash (6)
I believe the answer is:
tether
'put on a leash' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tether that I've seen before include "Rope to secure animal" , "Rope for hobbling animal" , "restrain boxers, say" , "End of ones --" , "Rope for restraining animal (6)" .)