Minor performer put on the bill? (5)

I believe the answer is:

extra

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

'minor performer' is the definition.
'extra' can be an answer for 'performer' (extra is a kind of performer). I'm not sure about the 'minor' bit.

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 "Run; in addition" , "Additional expense" , "spotted at rear of the platoon?" , "One has no lines" , "Actor in crowd scene, no lines" .)

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

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