Obscure meteorological object (5)

I believe the answer is:

cloud

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'obscure' is the definition.
(cloud can mean to obscure or conceal)

'meteorological object' is the wordplay.
'meteorological' becomes 'clou' (I can't justify this - if you can you should give a lot more credence to this answer).
'object' becomes 'D' (D is an example).
'clou'+'d'='CLOUD'

Can you help me to learn more?

(Other definitions for cloud that I've seen before include "Cumulus, for example" , "Obscure" , "Nebula" , "It hides the sun" , "Dull spot" .)

I've seen this clue in The Mirror.

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