Subject of single broadcast hard to follow
I believe the answer is:
english
'subject' is the definition.
(English is an example)
'single broadcast hard to follow' is the wordplay.
'broadcast' indicates anagramming the letters (letters scattered or cast around).
'hard' becomes 'h' (abbreviation used in pencil classifications).
'to follow' says to put letters next to each other.
'single' anagrammed gives 'englis'.
'englis'+'h'='ENGLISH'
'of' acts as a link.
(Other definitions for english that I've seen before include "Common language" , "to write these answers in?" , "Language of the shingle?" , "spin?" , "A country condiment?" .)