A stack of fruit in Ireland (8)
I believe the answer is:
limerick
'a stack' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'fruit in ireland' is the wordplay.
'fruit' becomes 'lime' (lime is a kind of fruit).
'in ireland' becomes 'rick' (I can't explain this - if you can you should give a lot more credence to this answer).
'lime'+'rick'='LIMERICK'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for limerick that I've seen before include "port used in Ireland" , "Humorous five-line verse" , "Humorous verse of 5 lines" , "City of humorous verse" , "Witty poem from mid-western Irish city" .)