Privacy I lost, due to reform (8)
I believe the answer is:
solitude
'privacy' is the definition.
(thesaurus)
'i lost due to reform' is the wordplay.
'to reform' indicates anagramming the letters.
'i'+'lost'+'due'='ilostdue'
'ilostdue' with letters rearranged gives 'SOLITUDE'.
(Other definitions for solitude that I've seen before include "Lone state" , "Isolated state - slide out (anag)" , "Lack of company" , "Avoiding company" , "Being by oneself" .)