Change allowance after late adjustment (10)
I believe the answer is:
alteration
'change' is the definition.
('alteration' can be a synonym of 'change')
'allowance after late adjustment' is the wordplay.
'allowance' becomes 'ration' (I've seen this before).
'after' is a charade indicator (letters next to each other).
'adjustment' is an anagram indicator.
'late' with letters rearranged gives 'alte'.
'ration' put after 'alte' is 'ALTERATION'.
(Other definitions for alteration that I've seen before include "Change" , "Amendment" , "Adjustment" .)