There’s no more? That’s a bit much! (3,3)
I believe the answer is:
the end
'a bit much' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.
'there's no more?' is the wordplay.
I cannot really see how this works, but
'there's' could be 'n' (I've seen this in other clues) and 'n' is present in the answer.
The remaining letters 'theed' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
'that's' is the link.
Can you help me to learn more?
(Other definitions for the end that I've seen before include "Final words on screen" , "last line of story" , "special person" , "Words on last page" .)