Possible Clues:

• Profane expression usually of surprise or anger
• 'He is a sort of -- at the table, serving to stop gaps' (Oliver Wendell Holmes, The Poet at the Breakfast Table)
• It's topless love. The compiler's fifty -- that's taken in with curse!
• Swear-word? The writer's left in old favourite for a start
• Former favourite compiler's receiving large curse
• Old cat or dog I have, catching fifty rats, say?
• !#$% or @&*^
• Obscenity (to be deleted?)
• A kind of profanity deleted in Watergate tape transcripts
• Four-letter word