Seaman determined to get around (5)
I believe the answer is:
about
'around' is the definition.
('about' can be a synonym of 'around')
'seaman determined' is the wordplay.
'seaman' becomes 'ab'.
'determined' becomes 'out'.
'ab'+'out'='ABOUT'
'to get' acts as a link.
(Other definitions for about that I've seen before include "not far away" , "Approximately, around" , "Circa" , "in the offing?" , "In conection with, all around" .)