Crossword Genius

Not exactly a carrier plane? (7)

Ross

I believe the answer is:

harrier

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for harrier that I've seen before include "that flies!" , "Long distance runner" , "Hare hound" , "Short-winged hawk" , "jump jet" .)

I've seen this clue in the Evening Standard.
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