Skill that's required for sailing (5)
I believe the answer is:
craft
'skill' is the definition.
(I know that craft is a type of skill)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for craft that I've seen before include "Vessel; skill" , "Skill in making things by hand" , "It requires special skill" , "Boat; skill" , "Vehicle for water or air" .)