Investigate, look into (7)
I believe the answer is:
explore
I believe this clue is a double definition.
'investigate' is the first definition.
(I know that explore is a more specific form of investigate)
'look into' is the second definition.
(exploring is a kind of looking into)
(Other definitions for explore that I've seen before include "Look around; examine" , "Travel through for purpose of discovery" , "Search and inquire into" , "Examine by touch" , "Carefully survey" .)