Busy as some regions of Ukraine? (8)
I believe the answer is:
occupied
'busy' is the definition.
(similar in meaning)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for occupied that I've seen before include "Employed" , "Full; working" , "Filled or in use" , "Captured" , "Inhabited or engaged" .)