Transmission point to herald brief shutdowns on radio? (7)
I believe the answer is:
synapse
'brief shutdowns on radio?' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.
'transmission point to herald' is the wordplay.
I cannot really see how this works, but
'point' could be 'se' (SE is an example) and 'se' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for synapse that I've seen before include "It links cells" , "Nerve cell connector" , "Part of the nervous system" , "Nerve junction" , "Gap between nerve cells across which signals pass" .)