| STOPSIGN | Indicate assuming raised location of red light for instance |
| PARASITE | Hanger-on at location of Red Devils? (8) |
| EMTS | Legal runners of red lights, briefly |
| STOP | Red light for the organist? (4) |
| STOPPER | One in a bottleneck getting a red light for each (7) |
| SIGNAL | Red light, for example, angering lads terribly (6,6) |
| DANGER | Red light, for example, angering lads terribly (6,6) |
| KERR | A cell which is used for producing short pulses of light for laser experiments named after John (4) |
| GOSSIP | Tattler reports green light for secret service in middle of Saipan (6) |
| GOLDSTANDARD | Green light for Longford to get benchmark of old monetary system (4,8) |
| COLIC | Cold oil fermented at speed of light for children's complaint (5) |
| ARRAYING | A stadium includes a shaft of light for dressing (8) |
| PARSEC | Analyse speed of light for astronomical distance (6) |
| GLIM | Flicker of light, for short |
| LEDGE | Sort of light, for example, backing shelf (5) |
| FLASHBULB | Source of light for photo |
| HALO | Ring of light for a saint or angel |
| QUARTZLAMP | Compact source of light for high-intensity floodlighting (6,4) |
| DEJAVU | Entertainer around back of stage bringing over light for illusion (4,2) |
| RAISE | Put up beams of light for the audience (5) |
