Material for two items of tableware (5,5)
I believe the answer is:
plate glass
'material' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'two items of tableware' is the wordplay.
'two items of' becomes 'plate' (I can't justify this - if you can you should believe this answer much more).
'tableware' becomes 'glass' (glass is a kind of tableware).
'plate'+'glass'='PLATE-GLASS'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for plate glass that I've seen before include "Material for eg shop windows" , "Window material" , "shop-front?" .)