| DORSAL | Term for the fin on the back of a fish (6) |
| ENTREE | French word based on the simple idea of a "way in", whether access to high society, admittance to a place such as an inn, the introduction to the heart of the meal, a musical prelude or a curtain-rais |
| CAUDAL | Fin on the tail of a trout (6) |
| PELVIC | Like bottom fins on a fish |
| SHARKS | Fish with pointed fins on their backs |
| CHROME | 1950s, the fins & ___ decade |
| DORSALFIN | Making for island on the back of a fish (6,3) |
| AIRCOOLED | Likely description for engines with fins on the cylinder. (3-6) |
| SPINE | Hard pointed defensive projection such as a porcupine's quill or a ray in the fin of a fish (5) |
| RAYS | Stiff bony spines in the fin of a fish (4) |
| SKEG | What is the fin underneath the rear of a surfboard? (4) |
| SEALS | Blubbery barking clappers, or rather streamlined aquatic mammals of the "fin-footed" order Pinnipedia, as compared to the fissipeds; or,wax signets of authenticity (5) |
| PECTORAL | Fin on each side of a dolphin or whale |
| EEL | Fish that might have a single long fin on top |
| EMPENNAGE | Stabilising structure at the rear of an aircraft, typically comprising the fin, rudder and tailplane (9) |
| AGES | Some postage stamps from the Belle 'poque and the Fin de Si'cle (4) |
| VENTRAL | In the event Ralph found the fin (7) |
| AIR | The cooling method for engines with fins on them. (3) |
| INFRONT | Leading when the fin got damaged: torn off (2,5) |
| INFERRED | Deduced the fin adjustment had been wrong (8) |
