Comic actor's raise? Want over a billion (4,5)

'comic actor's' is the definition.
I know nothing about this answer so I can't judge whether this works.

'raise? want over a billion' is the wordplay.
I cannot really see how this works, but
'raise?' could be 'jack' (jacking is a kind of raising) and 'jack' is found within the answer.
'want' could be 'lack' (synonyms) and 'lack' is found in the answer.
'billion' could be 'b' and 'b' is located in the answer.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?