Sailor has to win a goal (6)
I believe the answer is:
target
'a goal' is the definition.
(I know that target is a type of end)
'sailor has to win' is the wordplay.
'sailor' becomes 'tar' (term for a sailor).
'has' is a charade indicator (letters next to each other).
'to win' becomes 'get'.
'tar'+'get'='TARGET'
(Other definitions for target that I've seen before include "Mark to aim at" , "Select for attack" , "bull's eye" , "The object with the bullseye" , "Mark to be aimed at" .)