Possible Clues:

• A sentimental lover forgetting name of perfume
• Basil perhaps a sentimental sort, but no knight
• A poet like Byron forgetting name, like 21 and 23, say?
• Like rosemary or lavender, e.g.
• Odourous
• A gypsy with a twitch getting spicy
• Like sachets
• Smelling a rat, old spymaster suppressed then rejected CIA brief
• A nameless visionary, smelling nice
• A sentimental lover, name withheld, is spicy