Undercover operation (5)
I believe the answer is:
sting
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">undercover operation</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 sting that I've seen before include "Entrapment operation; sharp pain" , "Bee's weapon" , "English musician, b. 1951 -- a sudden pain" , "fleece?" , "Con: leader singer of Police" .)