Like stardust or could otherwise be lunar (7)

I believe the answer is:

nebular

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'like stardust or' is the definition.
I can't tell whether this defines the answer.

'otherwise be lunar' is the wordplay.
'otherwise' indicates anagramming the letters.
'be'+'lunar'='belunar'
'belunar' anagrammed gives 'NEBULAR'.

'could' is the link.

Can you help me to learn more?

(Other definitions for nebular that I've seen before include "Cloudlike" , "Like a cloud (in space)" , "Cloudy" , "Misty" , "Like dust that could be stellar" .)

I've seen this clue in The Globe and Mail.

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