People knotting lace and shreds (7)
I believe the answer is:
tatters
'shreds' is the definition.
('tatter' can be a synonym of 'shred')
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for tatters that I've seen before include "Rags, shreds" , "Rags and torn pieces" , "Torn pieces of cloth" .)