Pet store purchase (5)
I believe the answer is:
leash
'pet store purchase' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for leash that I've seen before include "Spanish city famous for swordmaking" , "(Dog's) lead" , "Bind" , "Strip for leading, a dog say" , "Rope or chain restraint" .)