Crossword Genius

Trailer, essentially (6)

Ross

I believe the answer is:

teaser

(Other definitions for teaser that I've seen before include "one using a backcomb" , "One who annoys people or cards wool" , "Difficult problem concerning Easter" , "Tricky question; intriguing preliminary advert" , "Puzzling question or gentle goader" .)

I've seen this clue in the Newsday.
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