Related Clues:

• Romantic relationship, perhaps illicit
• What's the matter with being 17 down in the end?
• Not, by the sound of it, a dark sort of business
• A liaison with a blonde at last!
• You'd love to have a tune that's so fortissimo
• Sounds like a market sort of business with a very loud tune
• In the matter of a market, by the sound of it
• Is that what's the matter with a very loud melody?
• There's business in the sound of where's there's business
• That does not sound like a matter for the dark
• A very loud tune for business
• Not a dark sound for the business
• A matter of buying and selling, by the sound of it (6)
• A matter for a market?
• Such a very loud tune cannot be a 17 across one, by the sound of it