Debt rarer as restructured (7)
I believe the answer is:
arrears
'debt' is the definition.
(I've seen this before)
'rarer as restructured' is the wordplay.
'restructured' is an anagram indicator (I've seen 'restructuring' mean this).
'rarer'+'as'='rareras'
'rareras' anagrammed gives 'ARREARS'.
(Other definitions for arrears that I've seen before include "Overdue debt" , "Amount needed to be paid back" , "Outstanding money" , "They're outstanding" , "Unpaid debts" .)