Ready for later revision (5)

I believe the answer is:

alert

'ready for' is the definition.
(thesaurus)

'later revision' is the wordplay.
'revision' is an anagram indicator.
'later' with letters rearranged gives 'ALERT'.

(Other definitions for alert that I've seen before include "Lively" , "Put on guard, warn" , "On one's toes" , "Watchful, quick-thinking" , "On the ball" .)

I've seen this clue in the Evening Standard.

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