The most common and most likely answer to this crossword clue is the 8 letter word MOUNTIES
I've seen this crossword clue in The Daily Telegraph
M
O
U
N
T
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S
More clues leading to the result MOUNTIES
- Doctor frees police up
- A doctor lets loose with cops in Canada
- Doctor frees police officers
- After brief period, releases North American force
- They form some unit of the Canadian police
- Officers riding free within two seconds
- Policemen in some unit reorganised
- Money order frees police force up
- Doctor solves problem for police …
Buddy explains!

The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does MOUNTIES mean?
MOUNTIES noun- A member of the Royal Canadian Mounted Police.
- A law officer, particularly one patrolling rural highways.