Former Soviet regions love sound of bombing (7)
I believe the answer is:
oblasts
'former soviet regions love sound' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'of bombing' is the wordplay.
'of' becomes 'o''.
'bombing' becomes 'blasts' (I can't explain this - if you can you should give a lot more credence to this answer).
'o'+'blasts'='OBLASTS'
Can you help me to learn more?
(Another definition for oblasts that I've seen is " Soviet provinces".)