Decorative mug (4)
I believe the answer is:
toby
'decorative mug' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for toby that I've seen before include "Mr Punch's dog, beer-jug" , "dog with frill round neck" , "fellow" , "Kind of jug" , "So-called knight" .)