Related Clues:

• Sauce thickener
• Thickening agent
• Sounds as if it's blooming like the start of 15 down, but it's all ground
• This ground will sound blooming blue
• It's 18 down till all is blue, by the sound of it
• Noise made by bluebottle in sauce thickener?
• Basis of a mould that sounds like blue bloom?
• Finely-ground grain used for thickening sauces
• Surprise new flower heard by thick sort in the kitchen
• Milled grain for a bloomer, say
• Sauce ingredient regularly ran, if stored in shade
• Thickening agent in cooking
• Ground powder in a bloomer, did you say?
• Cooking ingredient for cauldron a daughter omitted, sadly