Eavesdrops (7,2)
I believe the answer is:
listens in
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eavesdrops</span>' is the definition.<br/ ><span class="explanation-format__explanation">('listen in' can be a synonym of 'eavesdrop')</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for listens in that I've seen before include "earwigs" , "Intercepts messages" .)