Makes it correct for me to be in tails (6)
I believe the answer is:
emends
'makes it correct for me' is the definition.
I can't judge whether this defines the answer.
'be in tails' is the wordplay.
'be' becomes 'end' (ending is a kind of being).
'in' indicates putting letters inside.
'tails' becomes 'ems' (I can't justify this - if you can you should give a lot more credence to this answer).
'end' put into 'ems' is 'EMENDS'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for emends that I've seen before include "Improves,corrects" , "Edits text" , "Alters, corrects" , "Makes improvements or corrections" , "Corrects and improves the text" .)