Crossword Genius

Prevailing mood at Missouri field (10)

Ross

I believe the answer is:

atmosphere

'prevailing mood' is the definition.
(atmosphere can mean a mood or air)

'at missouri field' is the wordplay.
'missouri' becomes 'mo' (abbreviation for the US state).
'field' becomes 'sphere' (synonyms).
'at'+'mo'+'sphere'='ATMOSPHERE'

(Other definitions for atmosphere that I've seen before include "Spirit" , "We are always enveloped in this" , "blue?" , "Gas surrounding a planet" , "Surrounding ambience" .)

I've seen this clue in The Telegraph.
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