Crossword Genius

My stars in firmament? (7)

Ross

I believe the answer is:

heavens

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'firmament?' is the definition.
(synonyms)

I can't explain the remainder of the clue.

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(Other definitions for heavens that I've seen before include "Exclamation of surprise" , "Goodness" , "the blue" , "Sky - good grief!" , "Save hen (anag.)" .)

I've seen this clue in the Sydney Morning Herald.
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