The sort of glass for tableware? (5)
I believe the answer is:
plate
'for tableware?' is the definition.
(plate is a kind of tableware)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for plate that I've seen before include "This glass is thick as for shop window" , "Thin sheet, as of glass" , "Coat with metal" , "Denture" , "Helping of food" .)