Crossword Genius

Two essentials for roasting a dragon? (8)


I believe the answer is:


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'dragon?' is the definition.

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for spitfire that I've seen before include "WWII warplane" , "Quick-tempered person" , "Wartime fighter aircraft" , "World War Two fighter aircraft" , "WW2 fighter aircraft" .)

I've seen this clue in The Times.
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