Crossword Genius

Incredible mind a genius endlessly exercised (10)

Ross

I believe the answer is:

unimagined

'incredible' is the definition.
(similar in meaning)

'mind a genius endlessly exercised' is the wordplay.
'endlessly' means to remove the last letter.
'exercised' is an anagram indicator.
'mind'+'a'+'genius'='mindagenius'
'mindagenius' with its final letter taken off is 'mindageniu'.
'mindageniu' anagrammed gives 'UNIMAGINED'.

(Other definitions for unimagined that I've seen before include "Not thought of" , "Not foreseen" .)

I've seen this clue in The Telegraph.
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