Pat goes off to get the police (7)
I believe the answer is:
gestapo
'the police' is the definition.
(Gestapo is an example)
'pat goes off' is the wordplay.
'off' indicates anagramming the letters.
'pat'+'goes'='patgoes'
'patgoes' anagrammed gives 'GESTAPO'.
'to get' is the link.
(Other definitions for gestapo that I've seen before include "war force" , "Hitler's secret police" , "Postage (anag)" , "Geheime Staatspolizei" , "Nazi Germany's secret state police" .)