Raise glasses to Brown? (5)
I believe the answer is:
toast
I believe this clue is a double definition.
'raise glasses' is the first definition.
(as in making a toast with drinks)
'brown?' is the second definition.
(to brown something is to toast it)
'to' is the link.
(Other definitions for toast that I've seen before include "Brown under a grill" , "It may be eaten (or drunk!)" , "Food (that one can drink!)" , "Tribute (plus a clinking of glasses?)" , "Perhaps all the best" .)