Tumbler (7)
'tumbler' is the definition.
(synonyms)
This is all the clue.
(Other definitions for acrobat that I've seen before include "Performer of great agility and coordination" , "circus artiste" , "Athletic type" , "Tumbler" , "Boat car (anag.)" .)
'tumbler' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for glass that I've seen before include "Balloon, say" , "Something to drink from" , "barometer" , "Drinking vessel" , "Calm lake may be compared to this" .)