Crossword Genius

The yarn has a barbaric ring to it (6)

Ross

I believe the answer is:

crewel

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

'the yarn' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for crewel that I've seen before include "Twisted yarn for tapestry or embroidery" , "Fine worsted yarn" .)

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