Put right before noon and finished afterwards (7)
I believe the answer is:
amended
'put right' is the definition.
(I've seen this before)
'before noon and finished afterwards' is the wordplay.
'before noon' becomes 'am' (as in AM on a clock).
'and' means one lot of letters go next to another.
'finished afterwards' becomes 'ended' ('end' can be a synonym of 'finish'. I am not sure about the 'afterwards' bit.).
'am'+'ended'='AMENDED'
Can you help me to learn more?
(Other definitions for amended that I've seen before include "Carried out reforms" , "Correct, improve" , "Corrected" , "Modified for the better" , "changed" .)