Related Clues:

• Money essential if finishing early and retiring?
• Endless wrestling is a problem
• A fraction read out in mathematical problem?
• Problem in Descartes' raison d'être, finally
• Sounds like a bit of a problem
• Summarising score-draw, employing note
• "The ___ of All Fears" (Clancy novel)
• 15, for any row, column or diagonal of a 3x3 magic square
• Amount of money; add
• 2 + 2 = 4, e.g
• Society returns Greek letter - it's an answer to additional problem
• Ransom specification
• Figure under a line
• Altogether exhausted, getting words the wrong way round
• The whole lot sent back letters from Greece