It adds fuel to flame in Scottish town (4)

I believe the answer is:

wick

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'scottish town' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

(Other definitions for wick that I've seen before include "combustible drawer" , "one adding fuel to flame" , "Fishing harbour in northeast Scotland" , "Highland town" , "Candle string" .)

I've seen this clue in The Guardian.

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