Miniature dog (3)
I believe the answer is:
toy
'miniature dog' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for toy that I've seen before include "Object for a child to play with" , "Miniature (dog)" , "Trifle or dally with" , "Teddy or Dolly" , "Doll or teddy, say" .)