A helicopter axe? (7)

I believe the answer is:

chopper

I believe this clue is a double definition.

'a helicopter' is the first definition.
('chopper' can be a synonym of 'helicopter')

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

(Other definitions for chopper that I've seen before include "An informal helicopter, or an axe" , "Lizzie Borden" , "Motorbike" , "Small axe" , "that comes down on the block?" .)

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

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