Crossword Genius

Noise of bouncing plane after European disembarks (5)

Ross

I believe the answer is:

boing

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'noise' is the definition.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for boing that I've seen before include "is dull? Not right" , "Sound made by a spring" , "as spring goes" , "As spring sounds" .)

I've seen this clue in The Times.
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