State real changes coming after last month (7)
I believe the answer is:
declare
'state' is the definition.
(declaring is a kind of stating)
'real changes coming after last month' is the wordplay.
'changes' is an anagram indicator.
'coming after' means one lot of letters go next to another.
'last month' becomes 'dec'.
'real' is an anagram of 'lare'.
'lare' after 'dec' is 'DECLARE'.
(Other definitions for declare that I've seen before include "State emphatically" , "Profess" , "Aver, state" , "Assert" , "Make a statement, to customs perhaps" .)