Put me in and the answer's correct (5)
I believe the answer is:
amend
'correct' is the definition.
(amending is a kind of correcting)
'put me in and the answer's' is the wordplay.
'put me in' becomes 'mend' (I can't justify this - if you can you should believe this answer much more).
'and' says to put letters next to each other.
'the answer' becomes 'a' (abbreviation eg in Q and A).
'mend' put after 'a' is 'AMEND'.
Can you help me to learn more?
(Other definitions for amend that I've seen before include "Make minor improvements to (a document)" , "Alter in detail" , "make an improvement" , "Modify, correct" , "Make corrections to (eg, document)" .)