Possible Clues:

• Doctor tries new sort of lock
• Hole in wood for a tenon; sit more (anag.)
• It is quickly inside more than half the joint?
• Recess for a secretary
• Type of lock; moister (anag.)
• The hollowed-out part of a traditional wooden joint, into which the tenon goes
• Tenon recipient
• Perhaps one might get ten on in it