Groups aboard boats picked up sail (6)
I believe the answer is:
cruise
'sail' is the definition.
(I know that cruise is a more specific form of sail)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cruise that I've seen before include "Sail around" , "Tom, say" , "Ship holiday" , "journey" , "Holiday on liner" .)