A highly seasoned sausage used especially on pizza (9)

I believe the answer is:

pepperoni

(Other definitions for pepperoni that I've seen before include "spicy stuff" , "Spicy snacks" , "Butterfly-attracting shrub" , "Spicy Italian sausage" , "Hard, spicy beef and pork sausage" .)

I've seen this clue in The Independent.

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