The balance again is due out (7)
I believe the answer is:
residue
'the balance' is the definition.
(I've seen this before)
'again is due out' is the wordplay.
'again' becomes 're'.
'out' indicates an anagram (out can mean wrong or inaccurate).
'is'+'due'='isdue'
'isdue' anagrammed gives 'sidue'.
're'+'sidue'='RESIDUE'
(Other definitions for residue that I've seen before include "What is left, maybe dregs" , "What is left over, remainder (7)" , "Whatever is left over" , "Part remaining" , "What remains of something" .)