Crossword Genius

In Scotland, a tammy without decoration (3)

Ross

I believe the answer is:

tay

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'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" .)

I've seen this clue in the Evening Standard.
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