| TANH | Ratio of sinh to cosh (4) |
| MINH | Adopted name of Nguyen Sinh Cung, first president (1945-1969) of the Democratic Republic of Vietnam (4) |
| MACH | Austrian physicist whose name has been given to the ratio of the speed of flow of a gas to the speed of sound (4) |
| SINE | In a right-angled triangle, the ratio of the length of the side opposite an angle to the length of the hypotenuse (4) |
| CLUB | Cosh |
| GAIN | Factor by which power or voltage is increased by an amplifier, expressed as the ratio of output to input (4) |
| ODDS | Ratio of probability, esp. in betting (4) |
| HOCHI | Adopted name of Nguyen Sinh Cung, first president (1945-1969) of the Democratic Republic of Vietnam (2,3) |
| INHALES | Takes in "Sinh Ale" sometimes (7) |
| LIFEPRESERVER | A cosh used paradoxically to save the living? (4-9) |
| GOLFCLUB | Beat back with cosh that's iron, perhaps (4,4) |
| SANDBAG | Cosh used to provide protection (7) |
| SHOCKING | Frightful cosh brandished in front of ruler (8) |
| TRUNCHEON | The only legal form of cosh, one might say? (9) |
| NEPER | Unit used in physics to express the ratio of two quantities, equal to the natural logarithm of the ratio of the quantities (5) |
| CASEOFSCOTCH | Drink boxing - Caledonian breaking face battered with cosh (4,2,6) |
| CALLSTHESHOTS | Takes care of business that sells cosh crookedly (5,3,5) |
| ROBTHE | Ocean's 11 plan to violently cosh baritones (3,3,7) |
| CASINOS | Ocean's 11 plan to violently cosh baritones (3,3,7) |
| BLUDGEON | Reluctantly move forward, poked by large cosh |
