Crossword Genius

Feeling unwell with a cloud hanging over one? (5,3,7)

Ross

I believe the answer is:

under the weather

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

'feeling unwell' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'with a cloud hanging over one?' is the wordplay.
I cannot quite understand how this works, but
'with' could be 'w' (short for with) and 'w' is present in the answer.
'a' is present in the answer.
'one?' could be 'un' (northern English dialect form of 'one') and 'un' is located in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for under the weather that I've seen before include "the worse for wear" , "Out of sorts" , "Depressed" , "put umbrellas up here?" , "Seedy" .)

I've seen this clue in The Guardian.
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