Reforming -- as ruler will be? (5,8)
I believe the answer is:
going straight
'reforming' is the definition.
I don't know anything about this answer so I can't judge whether this works.
'ruler will be?' is the wordplay.
I cannot quite understand how this works, but
'ruler' could be 'r' (r is abbreviation for rex) and 'r' is located in the answer.
'be?' could be 'go' (going is a kind of being) and 'go' is located in the answer.
This explanation may well be incorrect...
'as' acts as a link.
Can you help me to learn more?
(Other definitions for going straight that I've seen before include "Giving up criminal activities" , "avoiding bird" , "Crow should be" .)