Ready to alter afresh (5)

I believe the answer is:

alert

'ready' is the definition.
(I've seen this in another clue)

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

'to' acts as a link.

(Other definitions for alert that I've seen before include "'Attentive, vigilant (5)'" , "sharp-witted" , "Danger warning" , "Signal danger" , "Wide-awake and watchful" .)

I've seen this clue in the Evening Standard.

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