Case of late support for long-standing account (9)
I believe the answer is:
chronicle
'account' is the definition.
(synonyms)
'case of late support for long-standing' is the wordplay.
'case of' says to hollow out the word (remove centre letters) (outsides of).
'support for' is a charade indicator (letters next to each other).
'long-standing' becomes 'chronic' (as in a chronic health problem).
'late' with its centre removed is 'le'.
'le' after 'chronic' is 'CHRONICLE'.
(Other definitions for chronicle that I've seen before include "Historical account" , "journal" , "Continuous record of events in order of time" , "History" , "Narrative description of past events" .)