Broadcaster got a snob raving about E-number (4,4,4)
I believe the answer is:
skye boat song
'number' is the definition.
(traditional song or 'number')
'broadcaster got a snob raving about e' is the wordplay.
'broadcaster' becomes 'sky' (Sky is a television company).
'raving' indicates an anagram.
'about' means one lot of letters go next to another.
'got'+'a'+'snob'='gotasnob'
'gotasnob' anagrammed gives 'boatsong'.
'boatsong' after 'e' is 'eboatsong'.
'sky'+'eboatsong'='SKYE BOAT SONG'
(Other definitions for skye boat song that I've seen before include "Patriotic Scottish ditty" , "air" , "It tells of Bonnie Prince Charlie's escape after Culloden" .)