Possible Clues:

• Doctor's clients
• Cases of knickers with knot in them
• Sounds like this is on the cards when they're in the waiting room
• Waiting room waiters
• The ill cared-for neckwear found among underwear
• People who might have a change of heart?
• Clinic clients
• Doctor is apt, going round part of hospital, to see them?
• Self-restraint on the radio by those looking for something to be done about the cuts
• Source of infection in obvious singular cases