Crossword Genius

As equipment in theatre idle sister wrecked (10)

Ross

I believe the answer is:

sterilised

'as equipment in theatre' is the definition.
(operating theatre)

'idle sister wrecked' is the wordplay.
'wrecked' indicates an anagram.
'idle'+'sister'='idlesister'
'idlesister' with letters rearranged gives 'STERILISED'.

(Other definitions for sterilised that I've seen before include "Like theatre equipment" , "immaculately clean" , "Thoroughly cleaned" .)

I've seen this clue in The Independent.
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