Israeli secret service (6)
I believe the answer is:
mossad
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">israeli secret service</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 mossad that I've seen before include "Israeli intelligence agency" , "Foreign intelligence agency" , "Israeli intelligence organisation" , "Israeli secret service" , "Agents" .)