"Hattie Harmony: ___ Detective" (kids' book by Elizabeth Olsen and Robbie Arnett) (5)

I believe the answer is:

worry

(Other definitions for worry that I've seen before include "Bother" , "Concern, anxiety, uneasiness" , "(Feel) anxiety" , "Fret, be disturbed in mind" , "'Anxiety, uneasiness (5)'" .)

I've seen this clue in the USA Today.

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