Possible Clues:

• Extra doctor? That's a relief
• Substitute having look around with uncertain expression
• ___ tenens (temporary substitute)
• Here's the doctor — that's a relief
• Rumours of depression arrive from such a doctor
• Look about with hesitation as someone filling in for another
• Substitute place for Roman
• One stands in chimney to absorb rising carbon monoxide
• Temporary doctor
• -- tenens (temporary officeholder)