Something more in the next race (5)

I believe the answer is:

extra

I'm a little stuck... Click here to teach me more about this clue!

'something more' is the definition.
I can't judge whether this defines the answer.

'in the next race' is the wordplay.
'in' says the answer is hidden in the clue.
'EXTRA' is hidden in the letters of 'next race'.

Can you help me to learn more?

(Other definitions for extra that I've seen before include "Bit player in film" , "Actor's part" , "Maybe wide" , "Small part actor" , "Supplemental" .)

I've seen this clue in the Sydney Morning Herald.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.