Don't agree I'd broken the agreement about (10)
I believe the answer is:
contradict
'don't agree' is the definition.
I can't judge whether this definition defines the answer.
'i'd broken the agreement about' is the wordplay.
'broken' is an anagram indicator.
'the agreement' becomes 'contract' (contract is a kind of agreement).
'about' means one lot of letters goes inside another.
'id' anagrammed gives 'di'.
'di' inserted inside 'contract' is 'CONTRADICT'.
Can you help me to learn more?
(Other definitions for contradict that I've seen before include "Deny" , "Assert the opposite of (a statement)" , "Refute" , "Have a different view" , "Argue against" .)