Contains changes? Okay (8)
I believe the answer is:
sanction
'okay' is the definition.
('sanction' can be a synonym of 'okay')
'contains changes?' is the wordplay.
'changes?' is an anagram indicator (I've seen 'change' mean this).
'contains' anagrammed gives 'SANCTION'.
(Other definitions for sanction that I've seen before include "Official approval (for an action)" , "Support" , "Official permission or authority" , "Agree to - penalty" , "OK" .)