Possible Clues:

• Grilled cheese go-with
• It kills with grilled cheese
• Of course this is to Mother to and so up in the red
• Of course that's the first thing to Mother to get down to and so get up
• To Mother to so standing comes first, of course
• Did the cat have a sup, too, when it spilled?
• To Mother, to what's red, of course, at first
• Take it as read, by the sound of it, as a matter of course
• Of course it's first to Mother and so up it's red
• To graduate thus with university, entering best possible first course