Heavenly cloud (6)

I believe the answer is:

nebula

(Other definitions for nebula that I've seen before include "Bright patch in sky caused by distant galaxy" , "Bright patch in sky from distant galaxy (6)." , "Cloudy mass in the heavens" , "Cosmic cloud" , "Misty appearance in the heavens" .)

I've seen this clue in the Penny Press.

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