Possible Clues:

• Shredding tool
• German traps vermin found in the kitchen
• Device for making bits smaller, or larger, we hear
• It's for making bits smaller or bigger, we hear
• It will start from scratch; that sounds more like it
• That's more like the sound of what's so rough
• See 20-Across
• Order of the Garter for culinary service
• Tool used on 13 Down
• It makes thing smaller, but sounding larger