Cosmic cloud of matter (6)

I believe the answer is:

nebula

(Other definitions for nebula that I've seen before include "Mass of interstellar gas" , "Hazy light; a slight cloudiness" , "Unable to be like a distant galaxy" , "Bright patch in sky caused by distant galaxy" , "Cloudy mass in the heavens" .)

I've seen this clue in The Times.

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