From experience one knows them to be made from fibre (5)

I believe the answer is:

ropes

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

I'm afraid I can't explain this answer.

(Other definitions for ropes that I've seen before include "known by clued-up workers?" , "weaker people may be on them?" , "Onion or pearl strings" , "They're known by experts" , "lines" .)

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

Want a hint initially instead of a full solution? Install my app