Possible Clues:

• That's about the end of it, but not the whole sale of, it
• The whole sale is about the end of it (6)
• The sort of business three blind mice could be lookingfor
• Trade that sells direct to public
• Wholesale's antithesis
• That's business, and it is in train
• That could be the business of three blind mice
• This trade serves the public
• Sell; pass on (e.g. gossip)
• The sort of business that blind mice were looking for