Chap back to see indifference (9)
I believe the answer is:
disregard
'indifference' is the definition.
(thesaurus)
'chap back to see' is the wordplay.
'chap back' becomes 'dis' (I can't justify this - if you can you should believe this answer much more).
'to see' becomes 'regard' ('regard' can be a synonym of 'see').
'dis'+'regard'='DISREGARD'
Can you help me to learn more?
(Other definitions for disregard that I've seen before include "Push aside" , "Overlook - inattention" , "Neglect, ignore" .)