Police try to bury dodgy tapes (7)
I believe the answer is:
gestapo
'police' is the definition.
(Nazi secret police)
'try to bury dodgy tapes' is the wordplay.
'try' becomes 'go' (both can mean an attempt).
'to bury' means one lot of letters goes inside another (inserted letters are buried inside).
'dodgy' is an anagram indicator (a dodgy or wrong order of the letters).
'tapes' is an anagram of 'estap'.
'go' going around 'estap' is 'GESTAPO'.
(Other definitions for gestapo that I've seen before include "Notorious secret police" , "Geheime Staatspolizei" , "Postage for Hitler's police" , "Brutal force" , "Postage to Nazi secret police" .)