Crossword Genius

Inert yet works forever (8)

Ross

I believe the answer is:

eternity

'forever' is the definition.
(synonyms)

'inert yet works' is the wordplay.
'works' indicates anagramming the letters (work can mean to twist or convulse).
'inert'+'yet'='inertyet'
'inertyet' is an anagram of 'ETERNITY'.

(Other definitions for eternity that I've seen before include "That's a very long time" , "You never come to the end of this" , "Blake innocently found it in an hour" , "World without end" , "Unending time" .)

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