Crossword Genius

US fighter's way of operating gadget (5)

Ross

I believe the answer is:

gismo

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'gadget' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for gismo that I've seen before include "Thingumajig - gadget" , "Device of American" , "Fancy device" , "mechanical device?" , "Useful gadget" .)

I've seen this clue in The Daily Mail.
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