Old toffee from Blarney (8)
I believe the answer is:
nonsense
This clue could be a double definition.
'old' is the first definition.
Both the definition and answer are adjectives. Perhaps there's a link between them I don't understand?
'toffee from blarney' is the second definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe there's an association between them I don't understand?
Can you help me to learn more?
(Other definitions for nonsense that I've seen before include "Humbug!" , "double Dutch?" , "Language without meaning" , "Having no intelligible meaning" , "tripe" .)