Possible Clues:

• Like a good waiter?
• One in clear case for treatment
• Uncomplaining; invalid
• The English______ , by M. Ondaatje
• Willing to wait
• Tolerant setter in clear
• Invalid without one, it's obvious
• One must be long-suffering with 14 down
• There's one in a sort of leather case in hospital
• One is in the sole right of being treated