| ASDIC | Early form of sonar developed by the British between the two World Wars |
| STEIN | Surname of American writer and eccentric; her Paris home was a salon for leading writers and artists between the two world wars (5) |
| AGATE | James ---, English diarist and theatre critic between the two World Wars (5) |
| LEEENFIELD | Rifle used by British Army in Boer War and the two World Wars (3,7) |
| SECOND | Unit of time defined as "the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium-133 atom" (6) |
| REPARATION | Compensation extracted from eg Germany after the two world wars (10) |
| LANDGIRLS | Female farm workers during the two World Wars(4,5) |
| UBOAT | A German military submarine used during the two world wars (1,4) |
| IRISHSEA | A vast dump of unexploded munitions from two world wars submerged in which body of water has stymied the idea of building a bridge across it? (5,3) |
| LAFAYETTE | Revolutionary War general with the nickname "The Hero of the Two Worlds" |
| EUSTACHIANTUBE | Hollow cylindrical structure that connects the middle ear with the nasopharynx and equalises the pressure between the two sides of the eardrum |
| WAGER | Ancient form of trial by personal combat between the two parties or their champions |
| MARNE | Tributary of the Seine that gives its name to two World War I battles |
| INTERRAMAL | Situated between the two branches of the lower jaw |
| CLEMENT | British Labour prime minister who served between the two terms of Winston Churchill (1945-51) (7,6) |
| ATTLEE | British Labour prime minister who served between the two terms of Winston Churchill (1945-51) (7,6) |
| POWERCOUPLE | The Obamas, for one or what fits between the two parts of each starred clue's answer? |
| GERMANSUBMARINES | Underwater fleets of two world wars |
| ARSON | Crime detectable by the use of sonar? (5) |
| WORLDSERIES | In North American baseball, a best-of-seven playoff between the two winning teams in the major leagues (5,6) |
