Possible Clues:

• Good to be in control — for its duration?
• Be lordly
• Grin with glee finally breaking rule
• Drops for the ear are unbeatable!
• 50% of foreigners, as a rule
• 'Better to -- in hell, than serve in heaven' ('Paradise Lost')
• As a rule, give up second outing
• Sounds like wet weather, as a rule
• Rule sometimes followed by cats and dogs, say?
• Start to light again as a rule