Possible Clues:

• Kay's evening drink?
• Before last part, raise drink
• Martini, for one
• Change tack into wind arriving at Manhattan, perhaps
• Harvey Wallbanger, for example
• Alcoholic mixture
• Business, changing tack, starts to import lucrative drink
• Drink for bird at the back
• Draw back tool initially with trouble -- a screwdriver?
• Prepare to fire back in Manhattan, for example