Possible Clues:

• "Dear" (2 words)
• Knife once used at breakfast time?
• Desk implement, or a hint to the starts of 17-, 22-, 36- and 55-Across
• A job for a snoop in 1 across and 19 down
• *Envelope-slitting tool (letters 6-9)
• Means of getting into correspondence
• A job for a snoop in 19 down for Frank Ward
• A job for a snoop in 27 across with Frank Ward
• Initially sharp, perhaps?
• One cuts right angle?