Toast when drinking to tosspot, sir? (6)
I believe the answer is:
'toast' is the definition.
(I've seen this in another clue)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for prosit that I've seen before include "Drinking call, good health to you" , "I sport during German toast to your health" , "Drinking salutation" , "Happy days, perhaps" , "Good luck to you" .)