Related Clues:

• Don's cutting blade which may be bloody
• Promise in certain letters only half fulfilled
• Plight of very old wife
• One promise nearly everyone makes
• Habit confined to something offensive — it's rude
• Four-letter word? Teacher uses it, being in a state
• Assertion made in letter I possibly read out
• Vow; security
• Security gives advantage to place
• 'He is a sort of -- at the table, serving to stop gaps' (Oliver Wendell Holmes, The Poet at the Breakfast Table)
• Undertaking to move carefully beneath power line
• Scoundrels ultimately misbehave and use bad language
• Confession read out loud in a letter
• "Dog" is term of abuse — so is this
• Blaspheme; damn