No more to discuss? (4,4)

I believe the answer is:

talk over

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'discuss?' is the definition.
(I know that discuss can be written as talk over)

'no more' is the wordplay.
'no' becomes 'talk' (I can't justify this - if you can you should believe this answer much more).
'more' becomes 'over' (I've seen this before).
'talk'+'over'='TALK OVER'

'to' acts as a link.

Can you help me to learn more?

(Other definitions for talk over that I've seen before include "Consider together - persuade" , "Discuss" .)

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

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