He tells you to raise your glasses to a saint and teacher (11)
I believe the answer is:
toastmaster
'he tells you to raise your glasses' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'to a saint and teacher' is the wordplay.
'saint' becomes 'st' (abbreviation).
'and' says to put letters next to each other.
'teacher' becomes 'master' (I've seen this before).
'to'+'a'+'st'+'master'='TOASTMASTER'
Can you help me to learn more?
(Other definitions for toastmaster that I've seen before include "one announces at dinner" , "Address given after my introduction" , "Master of ceremonies at a banquet" , "Official at formal dinner" , "Dinner speaker" .)