### Clue: Having a ball, including one's sweetheart (2,6)
### Answer: IN CLOVER 
 ### Explanation: Definition: Having a ball
  INC(abbrev. for "$$inc$$luding") LOVER(one's sweetheart)
Defn:  Having an enjoyable time,living in luxury, comfort and ease.  Apparently derived from the use of clover to fatten cattle – picture fat happy cows grazing in clover (if only they knew how to dance :-).