Patrick on autumn broadcast? (11,4)
I believe the answer is:
punctuation mark
'patrick on autumn broadcast?' is the definition.
The answer and definition can be both related to communication as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'patrick on autumn broadcast?' is the wordplay.
'broadcast?' indicates an anagram (I've seen 'broadcast' mean this).
'patrick'+'on'+'autumn'='patrickonautumn'
'patrickonautumn' anagrammed gives 'PUNCTUATION MARK'.
(Other definitions for punctuation mark that I've seen before include "period in US, say" , "Possibly stop" , "period in New York, perhaps? - with 5d" .)