Answer: burling

AnswerCrossword Clue
burlingBURL, to finish cloth by removing knots
burlingdome-shaped growth on the trunk of a tree; wartlike structure sometimes 2 ft. (0.6 m) across and 1 ft. (0.3 m) or more in height, sliced to make veneer
burlingto remove burls from (cloth) in finishing
burlingsmall knot or lump in wool, thread, or cloth