### Clue: Falstaff, maybe, here left drinkers' association imbibing special calories (2,5)
### Answer: LA SCALA 
 ### Explanation: Definition: Falstaff, maybe, here
 L(abbrev. for "left") + AA(abbrev. for Alcoholics Anonymous, the drinkers' mutual aid association) **containing**(imbibing) [ S(abbrev. for "special") + CAL(abbrev. for "calories", heat energy units) ].
Defn: Where the opera, Falstaff, may be performed.