Speedily vanishing into starry chaos (10)

I believe the answer is:

transitory

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'speedily vanishing into starry chaos' is the definition.
I can't judge whether this defines the answer.

'into starry chaos' is the wordplay.
'chaos' is an anagram indicator.
'into'+'starry'='intostarry'
'intostarry' with letters rearranged gives 'TRANSITORY'.

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(Other definitions for transitory that I've seen before include "Short-lived" , "Passing" , "Ephemeral" , "Brief" , "lasting long" .)

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

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