### Clue: Previous drink knocked back amid cheers (6)
### Answer: BYGONE 
 ### Explanation: Definition: Previous
 **Reversal of**(… knocked back) NOG(formerly, a kind of strong beer, or short for "eggnog" an alcoholic drink with beaten egg, milk and sugar) **contained in**(amid) BYE(short for "goodbye";cheers! as said when leaving).