Related Clues:

• That sounds like a naughty number
• Thus nothing could make 33 down catch you
• 'O, that's the end of 15 across (4)'
• 'O, that's what it is (4)'
• 'Nothing, nothing about a letter up at last (4)'
• Nothing could sound so naughty as this
• Worthless sort
• O, that's it! Think nothing of it
• Half of 10?
• Celsius freezing point of water
• See 22
• The kind of tolerance that means nothing
• Love, as symbolised by something like ring
• Cross about her lacking aspiration in love
• Less than one hour for action