Highly-decorated glazed earthenware (8)
I believe the answer is:
majolica
'highly-decorated glazed earthenware' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for majolica that I've seen before include "Highly decorated glazed earthenware" , "Pots" , "Highly-decorated style of earthenware (J, not I)" , "Italian tin-glazed pottery" , "Type of highly-decorated glazed earthenware" .)