Energy emission stopped by east German broadcaster (5,7)
I believe the answer is:
radio station
'energy' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'emission stopped by east german broadcaster' is the wordplay.
'emission' becomes 'radiation' (radiation is a kind of emission).
'stopped by' is an insertion indicator (stopping can mean blocking a gap).
'east german broadcaster' becomes 'ost' (I can't justify this - if you can you should give a lot more credence to this answer).
'radiation' placed around 'ost' is 'RADIO STATION'.
Can you help me to learn more?
(Other definitions for radio station that I've seen before include "Four" , "Sound broadcaster" , "Broadcasting channel" .)