Hint in a whodunit (4)

I believe the answer is:

clue

'hint in a whodunit' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for clue that I've seen before include "Aid to detection" , "contribution to crossword" , "Part of a crossword" , "One of twenty-four in this puzzle" , "Hint to help the puzzler" .)

I've seen this clue in the Newsday.com and the Newsday.

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