Make corrections to (5)
'make corrections to' is the definition.
(synonyms)
This is the entire clue.
(Other definitions for emend that I've seen before include "Polish" , "Improve (writing)" , "Make improvements to (text)" , "Correct/revise (a text)" , "Remove faults from" .)
(Other definitions for amend that I've seen before include "Corrct error, make a minor aleration" , "Alter in detail" , "Change to improve" , "Make corrections to (eg, document)" , "Make small improvements to" .)