Travel across estate accompanying a quiet police force (7)
I believe the answer is:
gestapo
'police force' is the definition.
(Gestapo is an example)
'travel across estate accompanying a quiet' is the wordplay.
'travel' becomes 'go' ('go' can be a synonym of 'travel').
'across' indicates putting letters inside.
'estate' becomes 'est' (I've seen this in other clues).
'accompanying a quiet' becomes 'ap' (I can't justify this - if you can you should believe this answer much more).
'est'+'ap'='estap'
'go' going around 'estap' is 'GESTAPO'.
Can you help me to learn more?
(Other definitions for gestapo that I've seen before include "Police detested" , "Nazi Germany's secret state police" , "war force" , "Nazi German police" , "Notorious secret police" .)