Young Sheldon, e.g. (4)

I believe the answer is:

nerd

(Other definitions for nerd that I've seen before include "Technical expert" , "Socially inept but knowledgeable person" , "Intelligent but single-minded expert" , "Boringly studious person" , "Foolish or annoying person" .)

I've seen this clue in The Wall Street Journal.

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