Crossword Genius

Meteorologist initially guessing about humidity (9)

Ross

I believe the answer is:

mugginess

'humidity' is the definition.
(mugginess is a kind of humidity)

'meteorologist initially guessing about' is the wordplay.
'initially' indicates taking the first letters.
'about' is an anagram indicator.
The first letter of 'meteorologist' is 'm'.
'guessing' is an anagram of 'ugginess'.
'm'+'ugginess'='MUGGINESS'

(Another definition for mugginess that I've seen is " close".)

I've seen this clue in The Telegraph.
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