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Atmosphere in April, possibly a revolutionary month (8)

Ross

I believe the answer is:

prairial

'a revolutionary month' is the definition.
(I know that Prairial is a type of revolutionary month)

'atmosphere in april possibly' is the wordplay.
'atmosphere' becomes 'air' (synonyms).
'in' is an insertion indicator.
'possibly' indicates anagramming the letters.
'april' anagrammed gives 'prial'.
'air' inserted inside 'prial' is 'PRAIRIAL'.

(Another definition for prairial that I've seen is " part of a calendar".)

I've seen this clue in The Guardian.
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