Secretly listen to a conversation (9)
I believe the answer is:
eavesdrop
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">secretly listen to a conversation</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for eavesdrop that I've seen before include "listen privately" , "Listen carefully" , "Overhear" , "Listen without the speaker's knowledge" , "Listen at windows" .)