Brutal force goes wrong: light touch accepted (7)
I believe the answer is:
gestapo
'brutal force' is the definition.
(I've seen this in another clue)
'goes wrong light touch accepted' is the wordplay.
'wrong' is an anagram indicator.
'light touch' becomes 'tap' (I've seen this in another clue).
'accepted' is an insertion indicator.
'goes' is an anagram of 'geso'.
'geso' going around 'tap' is 'GESTAPO'.
(Other definitions for gestapo that I've seen before include "Postage (anag)" , "Notorious secret police" , "Geheime Staatspolizei" , "Hitler's secret police" , "Nazi Germany's secret state police" .)