Deal is to reform on its own (8)
I believe the answer is:
isolated
'its own' is the definition.
I can't tell whether this defines the answer.
'deal is to reform' is the wordplay.
'reform' is an anagram indicator (letters in a new form).
'deal'+'is'+'to'='dealisto'
'dealisto' is an anagram of 'ISOLATED'.
'on' is the link.
Can you help me to learn more?
(Other definitions for isolated that I've seen before include "Separated from others" , "Cut off or left behind" , "Single" , "Placed alone" , "Placed apart from others" .)