___ out (go deep on a topic) (4)

I believe the answer is:

nerd

(Other definitions for nerd that I've seen before include "knowledgable geek" , "Boringly studious person" , "Sort of chap" , "Socially inept but knowledgeable person" , "Irritating person (slang)" .)

I've seen this clue in the Universal.

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