Crossword Genius

Feeling of being under a cloud? (5)

Ross

I believe the answer is:

gloom

I'm a little stuck... Click here to teach me more about this clue!

'a cloud?' is the definition.
(thesaurus)

'feeling of being under' is the wordplay.
I cannot quite see how this works, but
'of' could be 'o' and 'o' is present in the answer.
The remaining letters 'glom' is a valid word which might be clued in a way I don't see.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for gloom that I've seen before include "Dimness" , "Partial darkness" , "Dark depression?" , "Murk" , "Darkness; depression" .)

I've seen this clue in the Evening Standard.
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