Crossword Genius

One with no illusions is alert to change (7)

Ross

I believe the answer is:

realist

'one with no illusions' is the definition.
(I've seen this before)

'is alert to change' is the wordplay.
'to change' indicates anagramming the letters.
'is'+'alert'='isalert'
'isalert' with letters rearranged gives 'REALIST'.

(Other definitions for realist that I've seen before include "who may look for practical solution" , "Person who sees things without illusions" , "Practical type" , "Plato, for example" , "Practical sort" .)

I've seen this clue in The Times.
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