Axe officer guarding the front of the house (7)

I believe the answer is:

chopper

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'axe' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for chopper that I've seen before include "that comes down on the block?" , "Butcher's cleaver" , "An axe, or a slang helicopter" , "Motorbike" , "Small axe" .)

I've seen this clue in the Sydney Morning Herald.

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