East German secret police (5)
I believe the answer is:
stasi
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">east german secret police</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for stasi that I've seen before include "Force that spied" , "old secret service" , "Force behind Wall" , "Former German security service" , "Secret police of the former German Democratic Republic" .)