Crossword Genius

All-star display? (6)

Ross

I believe the answer is:

cosmos

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'all' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for cosmos that I've seen before include "Universe as an ordered whole" , "Everything that exists" , "Universe seen as a whole" , "The entire universe." , "well-organised world" .)

I've seen this clue in The Sun.
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