Sighting from the crow's-nest (4)
I believe the answer is:
land
'sighting from the crow's-nest' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for land that I've seen before include "Women farm workers in World War II" , "Alight; country" , "See 3" , "Light" , "See 22" .)