Old answer covering new business items (6)
I believe the answer is:
agenda
'business items' is the definition.
(I've seen this before)
'old answer covering new' is the wordplay.
'old' becomes 'aged' ('aged' can be similar in meaning to 'old'**).
'answer' becomes 'a' (abbreviation eg in Q and A).
'covering' indicates putting letters inside.
'new' becomes 'n'.
'aged'+'a'='ageda'
'ageda' placed around 'n' is 'AGENDA'.
(Other definitions for agenda that I've seen before include "Schedule - things to be done" , "things to discuss" , "Plan for meeting" , "Scheme" , "Items of business for committee meeting" .)