Grow old and change business items (6)
I believe the answer is:
agenda
'business items' is the definition.
(I've seen this before)
'grow old and change' is the wordplay.
'grow old' becomes 'age' (synonyms).
'change' is an anagram indicator.
'and' anagrammed gives 'nda'.
'age'+'nda'='AGENDA'
(Other definitions for agenda that I've seen before include "Programme of a meeting" , "List of business for a committee meeting" , "Something perhaps hidden" , "List of matters to be discussed at a meeting" , "Schedule, order of business" .)