Possible Clues:

• Formality observed when celeb goes to church
• Resolute vigor
• However, too much of this in food could made us flabby
• Option at the launderer's
• Carbohydrate, found in potatoes
• Cleaner's spray
• Stuff that stiffens, say collars
• Over-formality leading church
• That will make one a bit stiff way over the street, perhaps
• Carbohydrate; stiffener