Possible Clues:

• Dogfish Head's Notorious H.O.P., for one
• Letters after "double" or "hazy," at a bar
• Letters on some beer cans
• Hoppy beverage, briefly
• Hoppy beer, initially
• ''American'' bar staple
• Tavern initials
• Light-colored beer, briefly
• Hoppy order, briefly
• Brewpub acronym