| LOCK | Short section of a canal for raising or lowering a barge or narrowboat; or, an air-bubble in a pipe obstructing the flow of liquid (4) |
| EMBOLISM | Obstruction of an artery, typically by a blood clot or an air bubble (8) |
| SPIRIT | ___ level, a glass tube of liquid with an air bubble in it to test horizontality (6) |
| ACCIDENTAL | Sign raising or lowering a musical note |
| BLISTER | Air bubble in a coat of paint |
| SEED | Air bubble in a glass piece |
| BARGE | Type of waterway that may be traversed via narrowboat or barge (5) |
| PARBUCKLE | Sling-like rope used for raising or lowering casks (9) |
| BLISTERS | Air bubbles in a coat of paint (8) |
| LEVEL | Instrument with an air bubble designed to determine a horizontal or plumb line; an area of flat farmland; or, a section of a video game (5) |
| POLE | Device for propelling a barge or for vaulting; or, each of the two opposing points of a magnet (4) |
| PUMP | Device for raising or moving liquids, compressing gases or inflating tyres; a light shoe for dancing; or, a plimsoll (4) |
| VIAL | A miniature bottle or ampoule for liquid medicines; or, a small spirit-filled glass tube containing an air bubble that centralises when perfectly horizontal or plumb (4) |
| SHADING | Blending, hatching, scumbling or stippling to give an illusion of umbrae in art; the effect of dark/light; gradations; slight nuances; or, lowering of prices (7) |
| HALYARD | A line for hoisting or lowering a sail, flag or spar (7) |
| AIRLOCK | Music has the grip of a bubble in a pipe (3-4) |
| DUCK | Word for a quick dip, plunge or lowering of the head that became the name of a waterfowl whose behaviour reflects said action (4) |
| PULLEY | Invented by Archimedes, device with uses including hoisting or lowering a sail or a flag (6) |
| ADMIRALS | Naval chiefs equivalent in rank to Generals in the army or an air force's Air Marshals |
| ROSE | A flower depicted with castles, daisies, leaves etc on a narrowboat in a traditional form of folk art (4) |
