Possible Clues:

• Notice issue of newspaper's no leader or supplement
• Summing up process?
• More will be made with this
• Annexe
• Extra hearing transposes the limits of ultrasound
• 'Thing' minus 100 as an arithmetical process
• Supplement dependency about to be got rid of
• A job for the summer
• One of the four basic planks of arithmetic
• Rider in habit, not cold