Like many kids post-Halloween (5)

I believe the answer is:

hyper

(Other definitions for hyper that I've seen before include "Prefix meaning excessively, perhaps active" , "Unusually energetic" , "extraordinarily energetic" , "Over-stimulated" , "Excessively, active, say" .)

I've seen this clue in The New York Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.