Made up for a noted mistake (6)
I believe the answer is:
atoned
'made up for' is the definition.
(I've seen this in another clue)
'a noted mistake' is the wordplay.
'mistake' indicates anagramming the letters.
'noted' with letters rearranged gives 'toned'.
'a'+'toned'='ATONED'
(Other definitions for atoned that I've seen before include "Made reparation (for)" , "Made up for past wrongdoing" , "Made up for offence or sin" , "Expiated" , "Made up for, say injury" .)