Possible Clues:

• 'Nor does a parent get to fifty, as usual (6)'
• Accustomed
• Coming as no surprise
• Lost behind manor ruin - that's to be expected
• Ordinary or average
• Type of behavior
• Looking back, the foreign address has its own switch - is that not unusual?
• A body temperature of 98.6, e.g.
• Standard — well-adjusted
• Accepted