Possible Clues:

• Mayo Brothers walk-in
• One must be patient with one and nothing up in a double century
• Doctor's session
• Place or session at which treatment or advice is given
• Here people aren't treated well
• Place with instructions from pros
• 150 in 1100? Well, that's what you want to get if you go there
• Place for specialised treatment, from doctor or politician
• Well, that may make you get 150 in 1100
• Many left in pronouncedly icy hospital