Related Clues:

• Cardinal, ordinal, musical – or 4, perhaps
• The characters at the end of 15 across in 1984, for example
• ... one will get rid of pain
• & 9 Across Insensible, riotously enter party venue?
• Mathematical object used to count
• Count without feeling fear occasionally
• Anaesthetist possibly could be one?
• Figure, digit
• Maybe, one anaesthetic?