Crossword Genius

Bonus for one in the crowd (5)

Ross

I believe the answer is:

extra

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

'bonus' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for extra that I've seen before include "Actor's part" , "Accessory" , "Minor person screened" , "Maybe wide" , "(Theatrical) spear carrier" .)

I've seen this clue in The Globe and Mail.
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