Make amends before two o'clock (2,3)
I believe the answer is:
at one
'two o'clock' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'make amends before' is the wordplay.
I cannot quite understand how this works, but
'before' could be 'e' (I've seen this in other clues) and 'e' is found within the answer.
The remaining letters 'aton' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for at one that I've seen before include "in harmony" , "In agreement" , "Agreed" , "time to enjoy 21 and 15 [TURKEY and CRACKERS] s?" .)