Designate character to identify broadcaster (4,4)
I believe the answer is:
call sign
This might be a double definition.
'designate character' is the first definition.
The definition suggests a singular noun which matches the answer.
'broadcaster' is the second definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?
'to identify' acts as a link.
Can you help me to learn more?
(Other definitions for call sign that I've seen before include "Unique designation in radio communications" , "Radio ID" , "Radio identification" , "Radio station or aircraft identifier" , "Air Force One, say" .)