Possible Clues:

• Olfactory stimuli
• Aromatherapy cures?
• Perfumery emanations
• Dogs often pick them up
• Trackers' aids
• Sounds as if one knows how to get a little money into the ship
• Get the sound of the end of 3 down where one knows, by the sound of them
• Perfume counter array
• Hearing smells may be what they have in common ...
• Leads for hounds