Related Clues:
- Loud, harsh sound
- Car horn beep
- Play a trumpet, e.g
- Play loudly, as a 53-Down
- Whistle excessively strident, ultimately
- Sound of a tugboat's horn
- Make a harsh sound
- How drivers gain attention also close to depot
- [Go! The light turned!]
- Bugler's blast
- Prime Minister on the radio? Blast!
- Tugboat's sound
- Screeching from Red Robbo's employers many years back
- Play, as a horn
- Call from a tugboat