Rover's restraint (5)
I believe the answer is:
leash
'rover's restraint' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for leash that I've seen before include "Strip for leading, a dog say" , "Strap for holding a dog while walking" , "Line for holding dog" , "Rope or chain restraint" , "Animal restraint" .)