Made up and in agreement with date (6)
I believe the answer is:
atoned
'made up' is the definition.
(I've seen this before)
'in agreement with date' is the wordplay.
'in agreement with' becomes 'at one' (I've seen this before).
'date' becomes 'd' (common abbreviation eg in DOB, date of birth).
'atone'+'d'='ATONED'
'and' is the link.
(Other definitions for atoned that I've seen before include "Made reparation (for)" , "Expiated" , "Made up for past wrongdoing" , "Made redress" , "Made up for offence or sin" .)