Possible Clues:

• Sound of a four-letter word?
• Censor sound
• Sound that prevents what was actually said being heard
• Initially, banana skin repelled censor
• Censor opening of burlesque before strip? The reverse
• Call British prime minister going west
• Censor lawyer with key to one of the records
• Electronic censor
• It may replace a four-letter word
• Censored-word sound