Possible Clues:

• O, that's in the theatre
• Round the sorceress round the half-century
• Charming woman, about 50, in society
• A perfectly round plane figure
• Get around to 31 across
• Ring's shape
• It can follow each word in 17-, 38- and 61-Across
• Get around to it in the theatre (6)
• Go all around
• Group of friends comes round