Possible Clues:

• Five minutes after a quarter of
• 9 at 23 across 20 down? Little difference from other point under canvas
• 50 minutes after the hour
• Nearing the bell, maybe
• 11:50, vis-a-vis midnight
• ___-one (long odds)
• ___ one (12:50 on a clock)(2 words)
• Fifty after
• 600 seconds before the hour
• Shortly before the hour