Causes of some head scratching

This time we are looking on the crossword clue for: Causes of some head scratching.
it’s A 30 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: NITS.

Last seen on: –The Washington Post Crossword – May 29 2020
LA Times Crossword 29 May 20, Friday
LA Times Crossword 23 Jun 2018, Saturday
-The Washington Post Crossword – June 23 2018