Question One all for now maybe: who is extremely credulous? (5,8)

'now maybe who is extremely credulous?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'question one all' is the wordplay.
I cannot really see how this works, but
'question' could be 'q' and 'q' is found in the answer.
'one' could be 'an' (an apple is one apple) and 'an' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

'for' is the link.

Can you help me to learn more?