Crossword Genius

Ready to alter, possibly (5)

Ross

I believe the answer is:

alert

'ready' is the definition.
(thesaurus)

'alter possibly' is the wordplay.
'possibly' indicates an anagram.
'alter' anagrammed gives 'ALERT'.

'to' acts as a link.

(Other definitions for alert that I've seen before include "Vigilant - warning" , "Watchfully awake" , "Wakeful, observant" , "Quick to notice" , "Danger warning" .)

I've seen this clue in the Evening Standard.
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