Stick to one glass! (5)
I believe the answer is:
paste
I believe this is a double definition.
'stick to' is the first definition.
(I've seen this before)
'one glass' is the second definition.
(thesaurus)
(Other definitions for paste that I've seen before include "sound beating" , "Food for spreading or fixative" , "defeat" , "Adhesive, for wallpaper say" , "Adhesive; savoury spread" .)