### Clue: I'm drunk and chant an opening with cast (9,5)
### Answer: SINGAPORE SLING 
 ### Explanation: Definition: I'm drunk
 SING(to chant) + A("an" ) PORE(a small opening, say, in your skin, allowing for passage of fluid) **plus**(with) SLING(to cast;to throw).
Answer: The alcoholic concoction, originating from, as legend has it, the Long Bar at the Raffles Hotel in Singapore.