A colourful firework (6)

I believe the answer is:

maroon

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'firework' is the definition.
(maroon is a kind of firework)

I can't explain the rest of the clue.

(Other definitions for maroon that I've seen before include "distress signal" , "Could be a warning signal" , "Abandon on island, or a brownish-red colour" , "Abandon; firework" , "Abandon (eg, on island)" .)

I've seen this clue in the Evening Standard.

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