| Rating | Solver | Clue |
|---|---|---|
| SCHEME | System | |
| METHOD | System | |
| DOLBY | Sound system | |
| BINARY | Maths system | |
| IGNITION | Starter system | |
| LAW | Social system | |
| ORDER | Class system | |
| HIERARCHY | Class system | |
| RADAR | Aircraft-locating system | |
| LEGAL | Judicial (system) | |
| CASTE | Social system | |
| BLOODSTREAM | Circulatory system | |
| STEREO | Hi-fi system | |
| GALAXY | Star system | |
| LOUDSPEAKER | PA system | |
| REGIMEN | Prevailing system | |
| AUDIO | Sound system | |
| ABO | Circulatory system | |
| DEFENCE | Guard system | |
| METRIC | Measurement system | |
| TROY | Weight system | |
| AVOIRDUPOIS | Weight system | |
| RAILWAY | Transport system | |
| ISM | Belief system | |
| Postal system | ||