Related Clues:

• Somewhat sour like flat cake
• Open cake with jam etc
• Tasting sour like a lemon
• Sour-tasting pie?
• Sharp or sour in taste
• Flat pie
• However sweet, you'll not find her an 11 across
• Rev? O, there's the new page
• Rev, O that's all the business you do
• Rev. O., that's the best thing to do with 2 down
• The Rev, O, that, it seems, is all he gets in from his business (8)
• What a revolution in receipts!
• Rev. O, that's how much business he does
• However sweet, she can't be crusty with customers
• Cap size for you, Rev. O., the other way up