Be nosy (3)
I believe the answer is:
pry
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">be nosy</span>' is the definition.<br/ ><span class="explanation-format__explanation">(to pry is to investigate nosily)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pry that I've seen before include "Interfere" , "Be inquisitive" , "Stick one's nose in" , "Intrusively enquire" , "Stick nose into other's business" .)