Crossword Genius

A chopper with blades (10)

Ross

I believe the answer is:

helicopter

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This clue could be a double definition.

'a chopper' is the first definition.
(synonyms)

'with blades' is the second definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

Can you help me to learn more?

(Other definitions for helicopter that I've seen before include "surveillance vehicle" , "One equipped with blades" , "aircraft" , "surveillance equipment" , "Flier" .)

I've seen this clue in The Irish Independent.
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