Flash, loose foreign police officer (7)

I believe the answer is:

mountie

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'foreign police officer' is the definition.
'Mountie' can be an answer for 'officer' (Mountie is an example). I am not certain of the 'foreign police' bit.

'flash loose' is the wordplay.
'flash' becomes 'mo' (both mean a very short period of time).
'loose' becomes 'untie' (loose can mean to untie or unleash).
'mo'+'untie'='MOUNTIE'

Can you help me to learn more?

(Other definitions for mountie that I've seen before include "Canadian policemen" , "One boasting of getting man" , "Member of the Royal Canadian Mounted Police" , "Horse-riding Canadian cop" , "North American policeman" .)

I've seen this clue in The Times.

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