Spinnaker or jib
I believe the answer is:
sail
This clue is a double definition.
'spinnaker' is the first definition.
(I've seen this in another clue)
'jib' is the second definition.
(I've seen this in another clue)
(Other definitions for sail that I've seen before include "Be 4 [SEABORNE]" , "Navigate" , "Glide along" , "Sheet used to catch the wind" , "Ship's canvas" .)