Concerned with change of not long ago (6)
I believe the answer is:
recent
'not long ago' is the definition.
(I've seen this before)
'concerned with change' is the wordplay.
'concerned with' becomes 're' (re can mean regarding, concerning).
'change' becomes 'cent' (I have seen 'Small change' mean 'cent' so perhaps 'change' could also mean 'cent').
're'+'cent'='RECENT'
'of' acts as a link.
(Other definitions for recent that I've seen before include "Present day" , "Originating not long ago" , "Latest - current" , "Having happened lately" , "In the near past, not long ago" .)