Crossword Genius

Aerial transport for a lumberjack? (7)

Ross

I believe the answer is:

chopper

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'lumberjack?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'aerial transport for a' is the wordplay.
'aerial transport for' becomes 'chop' (I can't justify this - if you can you should give a lot more credence to this answer).
'a' becomes 'per' (eg 'one a day' means 'one per day').
'chop'+'per'='CHOPPER'

Can you help me to learn more?

(Other definitions for chopper that I've seen before include "Butcher's cleaver" , "Lizzie Borden" , "An axe, or a slang helicopter" , "Small axe" , "Motorbike" .)

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