Change me inside and out (5)
I believe the answer is:
amend
'change me' is the definition.
'amend' can be an answer for 'change' (amending is a kind of changing). I'm unsure of the 'me' bit.
'inside and out' is the wordplay.
'inside' becomes 'me' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'out' means one lot of letters goes inside another.
'me' placed inside 'and' is 'AMEND'.
Can you help me to learn more?
(Other definitions for amend that I've seen before include "Make small changes to" , "Corrct error, make a minor aleration" , "Change to improve" , "Correct or alter to improve" , "Modify, correct" .)