Crossword Genius

Tantalisingly tricky question (6)

Ross

I believe the answer is:

teaser

(Other definitions for teaser that I've seen before include "One who irritates playfully" , "Tricky question; intriguing ad" , "Difficult question" , "A difficult problem of Teresa" , "one using a backcomb" .)

I've seen this clue in The Times.
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