Crossword Genius

Thriller turned out down in hut (9)

Ross

I believe the answer is:

whodunnit

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But I can't explain it at all! Could you help me understand?

(Other definitions for whodunnit that I've seen before include "Detective story" , "yarn unravelled finally?" , "book" , "crime novel" , "literary mystery" .)

I've seen this clue in The Times.
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