Whose did he get incarcerated in stir wrongly? (6)
I believe the answer is:
theirs
'whose did he' is the definition.
I don't know anything about this answer so I cannot judge whether this works.
'incarcerated in stir wrongly?' is the wordplay.
'incarcerated' becomes 'he' (I can't justify this - if you can you should give a lot more credence to this answer).
'in' indicates putting letters inside.
'wrongly?' is an anagram indicator (I've seen 'wrongly' mean this).
'stir' with letters rearranged gives 'tirs'.
'he' going within 'tirs' is 'THEIRS'.
'get' is the link.
Can you help me to learn more?
(Other definitions for theirs that I've seen before include "Owned by them" , "Belonging to those people" .)