| WAVEAT | Signal by hand |
| AMBER | A warning signal, by the way, given by a doctor with little hesitation (5) |
| TAP | Signal by knocking |
| WIGWAG | Send a signal by waving a flag |
| FUZEES | Colored flares used as a warning signal by trucks and trains |
| WIPEOUT | Obliteration of one radio signal by another (7) |
| PETERSOUT | Card signal by bridge player mostly comes to nothing |
| TATTOO | Evening signal by drum or bugle recalling soldiers to their quarters; a form of body art; or, a short term for drumming with the fingers (6) |
| SOSOON | Distress signal by balloons with nitrogen. Already? (2,4) |
| CALL | A holla or summons; a bird's cry or a whistle imitating thus; a direction in square-dancing; or, a signal by bell, bugle or trumpet (4) |
| ASSEMBLY | A gathering of pupils, shareholders, UN leaders or worshippers; a military signal by drumbeat or bugle call; or, an at-home, ball or reception (8) |
| REVEILLE | From the French meaning "wake up", a signal by bugle or drum at daybreak to awaken soldiers (8) |
| CODE | Cryptic signal by fish on end of line (4) |
| COAXIAL | Of a cable, transmitting high-frequency electrical signals by means of two concentric conductors separated by an insulator (7) |
| FLARES | Signals by light, wide-bottomed trousers |
| DRESSAGE | Manoeuvres of a horse in response to body signals by its rider (8) |
| GANTRY | Support framework for railroad signals By Walter D. Feener |
| BLEEPS | Audible signals by side of bed disturbed sleep |
| KARATECHOPS | Top class bits of meat by kilo: they're delivered by hand |
| CADE | (of a young animal) Abandoned by its mother and raised by hand. |
