Listen secretly (9)
I believe the answer is:
eavesdrop
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">listen secretly</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eavesdrop that I've seen before include "Listen secretly to a private conversation" , "Listen secretly to others' conversations" , "Overhear" , "Listen at windows" , "Listen to others' conversation" .)