On a sugar rush, say (5)

I believe the answer is:

hyper

(Other definitions for hyper that I've seen before include "Prefix meaning excessively, perhaps active" , "Overexcited" , "Slang adjective for over-active or highly-strung" , "Prefix meaning 'Excessive'" , "Really excited" .)

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

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