Crossword Genius

Jumper that says "Track official" (7)

Ross

I believe the answer is:

starter

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'official' is the definition.
(starter is a kind of official)

I don't understand the remainder of the clue.

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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