Look into (11)
I believe the answer is:
investigate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">look into</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for investigate that I've seen before include "Search" , "Examine" , "carry out a formal enquiry" , "Explore" , "Enquire into" .)