Ask and prompt Victor to substitute Charlie (6)

I believe the answer is:

invite

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

'ask' is the definition.
(I know that invite is a more specific form of request)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for invite that I've seen before include "Ask (someone to visit)" , "Solicit" , "Ask to call" , "Encourage, ask" , "Ask round" .)

I've seen this clue in The Guardian.

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