Crossword Genius

Distinctive phrase fool finally changes (5)

Ross

I believe the answer is:

idiom

'distinctive phrase' is the definition.
(an idiom is a phrase or saying)

I can't explain the rest of the clue.

(Other definitions for idiom that I've seen before include "Group of words in which the meaning may not be obvious" , "Eg, over the moon" , "'Break a leg' or 'miss the boat'" , "Manner of speaking or writing" , "Characteristic style of a period" .)

I've seen this clue in The Times.
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