Nazi police (7)
I believe the answer is:
gestapo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nazi police</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for gestapo that I've seen before include "Brutal force" , "Nazi German police" , "Postage to Nazi secret police" , "Postage (anag)" , "Hitler's secret police" .)