Jumper that says "Track official" (7)

I believe the answer is:

starter

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'track official' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for starter that I've seen before include "Race gun firer" , "cooking served first?" , "Appetiser" , "Type of home" , "Beginner, or opening course of meal" .)

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