Crossword Genius

Delve __ (investigate) (4)

Ross

I believe the answer is:

into

(Other definitions for into that I've seen before include "Taking a lively and active interest in (colloq.)" , "Enthusiastic about" , "Teachers' trade union" , "Keenly interested in" , "Keen on (informal)" .)

I've seen this clue in the Newsday.
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