Revealing regrettable act in two different records (10)
I believe the answer is:
disclosing
'revealing' is the definition.
('disclose' can be a synonym of 'reveal')
'regrettable act in two different records' is the wordplay.
I cannot really see how this works, but
'act' could be 'closing' (closing is a kind of act) and 'closing' is found within the answer.
The remaining letters 'dis' 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).
Can you help me to learn more?
(Another definition for disclosing that I've seen is " revealing".)