Good boy, but needs to be corrected (7)
I believe the answer is:
righted
'corrected' is the definition.
('right' can be a synonym of 'correct')
'good boy but needs' is the wordplay.
I cannot quite see how this works, but
'good' could be 'right' (synonyms) and 'right' is located in the answer.
'boy' could be 'ed' (short for Edward) and 'ed' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...
'to be' is the link.
Can you help me to learn more?
(Another definition for righted that I've seen is " Made reparation".)