Crossword Genius

With 67-Across, "I need a hint” and a hint to uncovering four famous detectives (4)

Ross

I believe the answer is:

clue

(Other definitions for clue that I've seen before include "contribution to crossword" , "Crossword help" , "Luce (anag.)" , "Aid to detection" , "Lead" .)

I've seen this clue in The Wall Street Journal.
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