Yielders of warm, woolly fiber (6)

I believe the answer is:

llamas

(Other definitions for llamas that I've seen before include "South American animals related to camels but humpless" , "Andean pack animals" , "domesticated guanacos" , "S American animals related to the camel" , "South American pack animals" .)

I've seen this clue in The Wall Street Journal.

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