Quaff mainly as expression of sorrow (5)

I believe the answer is:
waugh
I'm afraid I can't explain this answer.
Can you help me to learn more?
(Other definitions for waugh that I've seen before include "Evelyn ..... wrote 'Brideshead Revisited'" , "SECOND PART OF 19 down" , "Evelyn --, English author" , "Evelyn -, twentieth century English novelist" , "See 4 Down" .)
