Possible Clues:

• Aromatic purple flower
• Perfume the French sell old queen
• Aromatic flower in strange elder van
• Shrub seller in America south of Los Angeles
• 'The -- Hill Mob', Ealing Studios film starring Alec Guinness
• Pale purple colour
• Colour of object choked by seaweed
• The colour of Harold Wilson's resignation honours list in 1976?
• Originally Vicky learned about perfume
• Genuine setback when about to sell plant