Distinctive atmosphere round one key northern constellation (6)
I believe the answer is:
auriga
'constellation' is the definition.
(I know that Auriga is a constellation)
'distinctive atmosphere round one key northern' is the wordplay.
I cannot really see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found within the answer.
'key' could be 'g' (I've seen this in other clues) and 'g' is located in the answer.
'atmosphere' could be 'aura' (synonyms) and 'aura' is located in the leftover letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Another definition for auriga that I've seen is " A group of stars".)