Crossword Genius

Obscurity not observed in radio broadcast (4)

Ross

I believe the answer is:

mist

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'obscurity' is the definition.
(thesaurus)

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(Other definitions for mist that I've seen before include "Fine spray" , "Thin layer of fog" , "Watery film" , "Think fog or low cloud" , "low-level cloud" .)

I've seen this clue in The Independent.
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