| RAYLEIGH | 3rd Baron -; title of John William Strutt, co-discoverer of argon who wrote The Theory of Sound (8) |
| ACOUSTIC | Relating to the theory of sound (8) |
| VEBLEN | Economist who wrote "The Theory of the Leisure Class" |
| ADAM | Smith who wrote "The Theory of Moral Sentiments" |
| ACOUSTICAL | Related to the theory of sound (10) |
| BURGHLEY | 1st Baron -; title of Elizabeth I's Lord High Treasurer William Cecil who built and lived in the prodigy house in Stamford with the "Hell Staircase" and "Heaven Room" (8) |
| SPANIARD | Title of John Lennon's second book of nonsensical stories and drawings, A_ In The Works (8) |
| SANDWICH | Bread-based lunchtime snack or meal which derived its name from the title of John Montagu (8) |
| DELAWARR | Thomas West, 3rd Baron -------, governor of Virginia after whom a bay, river and US state are all named (2,2,4) |
| KILLANIN | 1972-80 IOC President, Michael Morris, 3rd Baron ... (8) |
| LORDRAYLEIGH | Winner of the 1904 Nobel Prize in Physics born John William Strutt (4,8) |
| IGNORANT | Thick blend of argon and tin (8) |
| RAMSAY | The Gentle Shepherd author; his portraitist son; a co-discoverer of argon; or, a seven Michelin star chef (6) |
| NOBLEGAS | One of argon, neon etc. |
| LYTTON | 1st Baron -; title of the author of The Last Days of Pompeii whose son was appointed Viceroy of India in 1875 by friend Benjamin Disraeli (6) |
| MARLBOROUGH | 1st Duke of ---, title of John Churchill, English general who commanded British forces in the War of the Spanish Succession (11) |
| SILVA | From the Latin meaning "wood", the assemblage of trees in a given area; or, the truncated title of John Evelyn's forestry discourse presented to the Royal Society in 1662 (5) |
| SYLVA | From the Latin meaning "wood", the assemblage of trees in a given area; or, the truncated title of John Evelyn's forestry discourse presented to the Royal Society in 1662 (5) |
| ROCHESTER | 2nd Earl of -; title of John Wilmot, poet at the court of Charles II (9) |
| EARL | 11th - of Sandwich; title of John Montagu, owner of Mapperton House with his countess wife Caroline (4) |
