In Scotland, a tammy without decoration (3)
I believe the answer is:
tay
'decoration' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Perhaps there's a link between them I don't understand?
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for tay that I've seen before include "Bridge at Dundee" , "Scottish loch" , "Scotland's longest river" , "The - Bridge Disaster (McGonagall)" , "Dundee's river" .)