Helicopter (7)

I think it could be either:

Which length description are you looking for?:

chopper

'helicopter' is the definition.
(synonyms)

This is the entire clue.

(Other definitions for chopper that I've seen before include "type of aircraft" , "Small axe" , "Air transport" , "Lizzie Borden" , "Motorbike" .)

I've seen this clue in The Telegraph and The Sun.

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