| SWELCKIE | Northern Isles term for tidal race in Pentland Firth (8) |
| MERRYMENOFMEY | Tidal race in Pentland Firth (5,3,2,3) |
| STROMA | Island in Pentland Firth (6) |
| ROOST | Group of resting fowls or bats; or, a tidal race in Shetland and Orkney (5) |
| ABOIDEAU | One call covers duck seen on water for tidal gate |
| FIRTH | Strait, as in Pentland ___ (5) |
| EBB | Be turned to front of boat for tidal movement (3) |
| BORE | Drill for tidal flood (4) |
| SHETLAND | The lads going on tour, taking in Northern isles (8) |
| ORCADIAN | Whale princess finishes off in part of Northern Isles (8) |
| ALDERNEY | Separated from the French coast by a hazardous tidal race, the Channel Island with the capital and main town St Anne (8) |
| UNSTRAIN | Relax in wet weather on extreme northern isle (8) |
| GRAEMSAY | Marge getting confused, for instance, on Northern isle (8) |
| ORKNEY | Archipelago separated from Caithness in Scotland by the Pentland Firth (6) |
| ORKNEYISLANDS | What is separated from the mainland by the Pentland Firth? (6,7) |
| PENTLANDFIRTH | Location of Merry Men of Mey tidal race (8,5) |
| ALTEZZA | Arizona, then some old Northern Isles, leaving North Dakota to climb height in Italy |
| YELL | Large island in the Northern Isles (82 sq miles; pop about 1,000) (4) |
| NORN | Extinct North German language spoken in the Northern Isles (4) |
| SIMMERDIM | Night-long midsummer twilight in Northern Isles (6,3) |
