It's just too much and that's all there is to it! (3,3)

I believe the answer is:

the end

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'it' is the definition.
The definition suggests a singular noun which matches the answer.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for the end that I've seen before include "special person" , "Words on last page" , "Final words on screen" , "last line of story" .)

I've seen this clue in the Evening Standard.

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