Notes a mistake and makes amends (6)
I believe the answer is:
atones
'makes amends' is the definition.
(I've seen this before)
'notes a mistake' is the wordplay.
'mistake' is an anagram indicator.
'notes'+'a'='notesa'
'notesa' is an anagram of 'ATONES'.
'and' acts as a link.
(Other definitions for atones that I've seen before include "Makes amends using a stone" , "Makes up for injury or offence" , "Makes up for, say sin" , "Make amends for sin" , "Does penance with a stone" .)