| PERCEPT | Imperceptible surroundings of the concept you can see (7) |
| ELTON | Zoologist and author of Animal Ecology who was one of the inventors of the concept of the food chain (5) |
| HABITAT | Usual natural surroundings of Tabitha going round (7) |
| MODICUM | A little master caught in surroundings of hate (7) |
| LOCKING | Noisy surroundings of Auckland centre in grand, extremely smart fastening bolt (7,4) |
| MANETHO | Egyptian priest of the 3rd century BC whose Greek Aegyptiaca (History of Egypt) originated the concept of pharaonic dynasties (7) |
| RADICAL | The base form of a word, a political extremist, a reactive chemical species, sign or zero of a function, all linked by the concept of "root" (7) |
| ANDREWS | Surname of one of the designers of RMS Titanic; or, the chemist who established the concepts of crit |
| SENTFOR | Summoned often, perhaps, in surroundings of squalor (4,3) |
| SETTING | Surroundings of something set at last in good position |
| COULOMB | Name, inscribed on the Eiffel Tower, of a French engineer who built a fort in Martinique before pioneering the concept of electric charge required to calculate electrical power (7) |
| PACIFIC | Peaceful surroundings of Tahiti? |
| RESORTS | Surroundings of many hotels |
| NOTMANY | Imperceptible |
| SHADOWY | Imperceptible |
| TRIVIAL | Imperceptible |
| GRADUAL | Imperceptible |
| LAPLACE | French polymath who came close to postulating the concept of the black hole with what he called corps obscur, or "dark body" (7) |
| AUSTRIA | Country "Osterreich" where the concept of Gemutlichkeit refers to a feeling/state of comfort, contentment, cordiality, cosiness and good cheer (7) |
| BABBAGE | 19th century English mathematician who originated the concept of a programmable computer (7) |
