| RIFLING | What are the spiral grooves on the inside of a gun barrel? (7) |
| NOCKS | In archery, the grooves on the fletched ends of arrows for engaging the bowstrings (5) |
| FLUTE | Ornamental vertical or spiralling groove on the shaft of a column, pilaster etc. (5) |
| SULCUS | Groove on the surface of the brain |
| RIFLE | A firearm so named for the process of adding a spiral groove in the barrel |
| BIBURY | Village in the Cotswolds, site of the Arlington Row, the cottages pictured on the inside of the English passports (6) |
| JAMESBOND | Figure seen through the end of a gun barrel |
| CALIBRE | The internal diameter of a gun barrel? (7) |
| MUZZLE | The front end of a gun barrel (6) |
| CRUST | Argol, the acidic deposit on the inside of a bottle of port |
| PRONATE | Walk with weight on the inside of the foot instead of the centre (7) |
| THREAD | The spiral part on the outside of a screw (6) |
| BORE | Word, distantly related to "gullet, pharynx", for the hollow part of a gun barrel or other tube; or, said cylinder's calibre or diameter (4) |
| TRACKSHOE | One of a pair of spikes in grooves on garden tool |
| REEDED | Made grooves on, as the edge of a coin |
| POSY | Small bunch of flowers; or, a sentiment or motto engraved on the inside of a signet ring or wedding band (4) |
| OSSELET | A hard substance growing on the inside of a horse's knee |
| CONRADHILTON | "Leave the shower curtain on the inside of the tub" |
| COCHLEA | What is the spiral cavity of the internal ear where sound vibrations are converted into nerve impulses? (7) |
| SCALA | A ladder-like structure, such as one of the spiral canals in the cochlea |
