Was in possession to do new changes (5)
I believe the answer is:
owned
'was in possession' is the definition.
I can't tell whether this definition defines the answer.
'do new changes' is the wordplay.
'changes' indicates anagramming the letters.
'do'+'new'='donew'
'donew' anagrammed gives 'OWNED'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for owned that I've seen before include "Had possession of" , "Endow (anag)" , "to oneself?" , "fully paid off?" , "admitted making confession" .)