Canadian police unit — some corrupt (8)
I believe the answer is:
mounties
'canadian police' is the definition.
(nickname for the Royal Canadian Mounted Police)
'unit some corrupt' is the wordplay.
'corrupt' indicates an anagram.
'unit'+'some'='unitsome'
'unitsome' is an anagram of 'MOUNTIES'.
(Other definitions for mounties that I've seen before include "Canadian federal police" , "Police force of Canada" .)