The most common and most likely answer to this crossword clue is the 7 letter word CLIMATE
I've seen this crossword clue in The Daily Telegraph
C
L
I
M
A
T
E
More clues leading to the result CLIMATE
- Prevailing attitude of European after court has capital injected
- Atmosphere around capital city cold and extremely tense
- Capital extremely tense after cold weather
- The weather, etc, recalled around S American capital
- Calvin at intervals with partner – prevailing trend
- Almost cut China’s temperature etc
- General character that may be changing dangerously?
- Halfway to the highest point, friend is on trend
- Current trend in opinion Alec and Tim manipulated
- Around capital, cold and extremely tense atmosphere
Buddy explains!

The straight part
We know that "atmosphere" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case atmosphere = climate.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does CLIMATE mean?
CLIMATE noun- An area of the earth's surface between two parallels of latitude.
- A region of the Earth.
- The long-term manifestations of weather and other atmospheric conditions in a given area or country, now usually represented by the statistical summary of its weather conditions during a period long enough to ensure that representative values are obtained (generally 30 years).
- The context in general of a particular political, moral etc. situation.
- To dwell.