Related Clues:

• A car spares shop may have one over a barrel!
• Strict librarian, perhaps, used to suppress reports
• Reclines (anag.)
• Recline informally on sea-front -- it offers some peace
• Part of exhaust system
• Piece together with this means of suppressing report
• By which car was shut up in garage?
• Keeps it quiet taking someone out to do target practice without a racket
• Gunman's attachment found under a car?
• Noise suppressor
• Keeps it quiet taking someone out for a few shots without making a racket
• One suppressing inconvenient report on firing?
• Sincere changes, inserting line that moderates report
• Muffler acquired by nieces playing around lake and river
• Gun accessory