Possible Clues:

• Show contempt for dramatist's worthless article
• Put the boot in to G.B.S. will some delicacy
• Trifle making Rex sick, unfortunately, fruit's provided
• May recoils first seeing cheap worthless article
• Give G.B.S. a boot in the rear for a little snack
• Put the boot in for the G.B.S. by way of delicacy