Crossword Genius

Nut which can spontaneously combust (9)

Ross

I believe the answer is:

pistachio

(Other definitions for pistachio that I've seen before include "Food" , "Yellowish-green" , "Nut tree" , "Nut - it is a chop (anag)" , "Type of nut" .)

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