Possible Clues:

• In three-quarters of an hour, do get the bouquet
• The Guardian's about to make a stink
• Bouquet on first grave
• Nothing gloomy for the bouquet
• Stink created by party in time? That's not hard
• Duck's grim smell
• Frodo urgently hides aroma
• Fragrance preceding 18, by the sound of it?
• Smell of ozone, grim
• Smell from party we have outside