So sad, broadcast about English port (6)
I believe the answer is:
odessa
'port' is the definition.
(I've seen this before)
'so sad broadcast about english' is the wordplay.
'broadcast' is an anagram indicator.
'about' is an insertion indicator.
'english' becomes 'e' (abbreviation).
'so'+'sad'='sosad'
'sosad' anagrammed gives 'odssa'.
'odssa' placed around 'e' is 'ODESSA'.
(Other definitions for odessa that I've seen before include "Port city on the Black Sea" , "Seaport" , "Battleship Potemkin mutiny port" , "Port city of Ukraine" , "Ukrainian Black Sea port" .)