British single-seat fighter aircraft designed by R J Mitchell (8)

I believe the answer is:

spitfire

(Other definitions for spitfire that I've seen before include "Hot-tempered person or British plane in WW2" , "WW2 fighter aircraft" , "Fierce-tempered person" , "Fighter aircraft in WWII" , "British fighter plane of WW2, or a fiery-tempered person" .)

I've seen this clue in The Independent.

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