Work with yarn and needles (4)
I believe the answer is:
knit
'work with yarn and needles' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for knit that I've seen before include "(Bone) heal; contract (brows)" , "Link closely together" , "Unite; work wool" , "Tighten (eyebrows) in a frown; unite" , "Fuse" .)