Cables novice sailors must learn (5)
I believe the answer is:
ropes
'cables' is the definition.
The definition and answer can be both man-made objects as well as being plural nouns.
Perhaps you can see an association between them that I can't see?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for ropes that I've seen before include "Onion or pearl strings" , "Strong cords" , "Experts are familiar with these" , "Ties" , "Stout cords" .)