Crossword Genius

Jack Brown is popular in Scotland (6)

Ross

I believe the answer is:

tartan

I'm a little stuck... Click here to teach me more about this clue!

'popular in scotland' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'jack brown' is the wordplay.
'jack' becomes 'tar' (both are informal terms for sailor).
'brown' becomes 'tan' (tan is a kind of brown).
'tar'+'tan'='TARTAN'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for tartan that I've seen before include "Woollen checked material" , "Scots plaid" , "Woollen fabric with plaid design" , "Clan fabric" , "Scots cloth pattern" .)

I've seen this clue in The Globe and Mail.
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