British fighter plane designed in the 1930s by Reginald Joseph Mitchell (8)

I believe the answer is:

spitfire

(Other definitions for spitfire that I've seen before include "Famous RAF fighter" , "Quick-tempered person" , "World War Two fighter aircraft" , "WWII warplane" , "Fighter aircraft in WWII" .)

I've seen this clue in The Times and The Sunday Times.

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