Possible Clues:

• Medical temp?
• Professional who stands in for another
• Greek character's pass upset relief worker
• A stand-in for a doctor
• Professional who substitutes temporarily for another
• He fills in chimney - it's freezing inside
• Behold, there's a stand-in with it for the doctor
• In practice, a substitute
• One has to be patient with one who is only a stand-in
• A substitute doctor