| EMBOLISM | The obstruction of an artery, typically by a blood clot or an air bubble (8) |
| 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) |
| DEMOLISH | Finds mole is overseeing part of China to topple the obstruction (8) |
| EMBOLIA | Medical: a blood clot or air bubble in the brain (7) |
| UNCLOG | Peacekeepers take a wooden shoe to remove the obstruction (6) |
| BARBERSHOP | Style of a cappella vocal music sung, typically, by a quartet of men (10) |
| AMPHIBIAN | A cold-blooded vertebrate animal such as frogs, toads, newts and salamanders who have an aquatic gill-breathing larval stage followed (typically) by a terrestrial lung-breathing adult stage |
| ANEURYSM | Cardiovascular disease which involves widening of an artery, caused by weakening of the artery wall (8) |
| ADMIRALS | Naval chiefs equivalent in rank to Generals in the army or an air force's Air Marshals |
| ODOMETER | Instrument for measuring the distance travelled by a vehicle, typically by counting wheel rotations (8) |
| ATHEROMA | Fatty deposit in the inner lining of an artery which can obstruct blood flow (8) |
| DAWNRAID | An early morning unannounced move into a premises, typically by the police (4,4) |
| SINKHOLE | A cavity in the ground formed typically by water erosion (8) |
| ANEURISM | Swelling of the wall of an artery (8) |
| HANDBAGS | The cards we're dealt at the outset bring about gruelling stresses that are shouldered typically by women |
| 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) |
| BLISTERS | Air bubbles in a coat of paint (8) |
| ARTERIAL | Of an artery |
| 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) |
| EMBOLUS | Blood clot or air bubble |
