Such a track has presumably been burnt up (6)

I believe the answer is:

cinder

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'such a track' is the definition.
(cinder track is a kind of track)

I can't explain the rest of the clue.

(Other definitions for cinder that I've seen before include "Refuse of burnt coal" , "Exhausted piece of coal" , "Piece of burnt coal" , "Fragment of matter left by a fire" , "Piece of burnt-out coal" .)

I've seen this clue in the Evening Standard.

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