Possible Clues:

• Picked out unfamiliar details about Ring
• Foreign toad lies in quarantine
• Walled off
• Remote, lonely
• Oldies at exchange off the beaten track
• One being thus delayed, departs alone
• It's hard to find one local criticised harshly over nothing
• Placed by itself
• Institute was put up for sale overlooking central chateau in the middle of nowhere
• One was very critical about opera's overture alone