Crossword Genius

Aeroplane prank: stewardess ultimately vanishing (3)

Ross

I believe the answer is:

jet

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'aeroplane' is the definition.
(jet is a kind of aeroplane)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for jet that I've seen before include "Black; spurt" , "Glossy black colour" , "Rapid stream of liquid or gas" , "Jumbo plane?" , "Very black or fast plane" .)

I've seen this clue in The Independent.
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