Crossword Genius

Passing hard prune stone, with Pepe's bowels opening? (9)

Ross

I believe the answer is:

ephemeral

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'passing' is the definition.
(synonyms)

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(Other definitions for ephemeral that I've seen before include "A mere help (anag) - short-lived" , "short term gain" , "Short-lived, passing quickly" , "Fugitive" , "Transitory" .)

I've seen this clue in The Guardian.
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