Obscure fairy tale prince queen ignored? (3)

I believe the answer is:

fog

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

'obscure' is the definition.
(I know that obscure can be written as fog)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for fog that I've seen before include "Confusion" , "Bafflement" , "Bank restricting visibility" , "Impenetrable mist" , "Obscure" .)

I've seen this clue in The Independent.

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