Even now zero energy cuts agreed (5,2)
I believe the answer is:
quite so
'agreed' is the definition.
(both can be said to indicate agreement)
'even now zero energy cuts' is the wordplay.
'even' becomes 'quits' (as in 'call it quits').
'now zero' becomes 'o' (O resembles 0. I am not sure about the 'now' bit.).
'energy' becomes 'e' (physics symbol as in E=mc2).
'cuts' is an insertion indicator (some letters cut their way into a word).
'quits'+'o'='quitso'
'quitso' placed around 'e' is 'QUITE SO'.
Can you help me to learn more?
(Another definition for quite so that I've seen is " Indeed".)