| Answer | Crossword Clue |
|---|---|
| TOOT | Factory whistle sound |
| SIREN | Factory whistle. |
| NOON | Factory whistle time |
| NOONS | Factory-whistle times |
| NOON | Factory whistle time, perhaps |
| TOOTER | Factory whistle, at noon |
| NOON | Factory whistle time, often |
| NOON | When a factory whistle blows |
| NOON | When a factory whistle may blow |
