Possible Clues:

• With mustard and fire within
• Old iron basket with family emblem round outer side
• Not a lot of space prepared for flame bearer
• One may shed some light, destroying secrets
• Old torch of Home Counties set into heraldic device
• Old form of illumination fixed to top point, not bottom
• Mustard goes with it at first, but make light of it altogether (7)
• Formerly a light salad plant, and exported
• Secrets destroyed in burning basket
• Flaming torch in the Home Counties planted into hill-top