Crossword Genius

Like a dream of no importance (10)

Ross

I believe the answer is:

immaterial

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'of no importance' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

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(Other definitions for immaterial that I've seen before include "of no importance" , "unimportant" , "Irrelevant" .)

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