Possible Clues:

• Independent enterprise cancelling head's contract
• Bound by this to be in a false set
• Indeed that's to be found in a false set
• In study prepared true contract
• With sign of slight damage inside, harden and contract
• Sealed agreement required in bridgework
• Signed contract wearing a false smile?
• By this one might be bound to be in a false set
• False teeth put in before contract
• Indeed that's what's in it for the toothless