Possible Clues:

• What 22-, 35-, and 47-Across cease to be, if you subtract an 's' from their ends
• Remarkable way one may be characterised?
• Curious, not ending in an S
• Carol joins university with up-and-coming artist as a one-off
• Extraordinary ruling, as stupid
• Atypical ... or like the first word in the answer to 18-, 24-, 51- or 62-Across
• Unusual — striking
• Gnu's lair (anag.)
• As sheep may be, but not cattle or horses? Strange
• Remarkable, as sheep but not goats may be