Drinking glass (7)
'drinking glass' is the definition.
(I know that tumbler is a type of drinking glass)
This is all the clue.
(Other definitions for tumbler that I've seen before include "Drinking glass or old acrobat" , "One flips" , "appears to be falling" , "will hold water" , "might be full of drink" .)
'drinking glass' is the definition.
(I know that rummer is a type of drinking glass)
This is the entire clue.
(Other definitions for rummer that I've seen before include "Comparatively quaint" , "Stemmed drinking glass" , "glass in the bar" , "drinking-vessel" , "Stranger" .)