Beginner in the world of racing? (7)

I believe the answer is:

starter

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'beginner' is the definition.
(I know that starter is a type of beginner)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for starter that I've seen before include "Beginner, or opening course of meal" , "Type of home" , "No substitute" , "Race gun firer" , "cooking served first?" .)

I've seen this clue in the Evening Standard.

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