Stick to the glass (5)
I believe the answer is:
paste
This clue is a double definition.
'stick to' is the first definition.
(I've seen this before)
'glass' is the second definition.
(thesaurus)
'the' is the link.
(Other definitions for paste that I've seen before include "Stick - imitation gems" , "An adhesive, or material for artificial gems" , "Adhesive, for wallpaper perhaps" , "Adhesive, doughy, or jewel-like substance" , "Adhesive gum" .)