Seaman determined to get around (5)
I believe the answer is:
Here is my best explanation:
'around' is the definition.
('about' can be a synonym of 'around')
'seaman determined to' is the subsidiary indication.
'seaman' becomes 'ab'.
'determined to' becomes 'out' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'get' is the link.
(Other definitions for about that I've seen before include "Nearly", "Circa", "Regarding", "Apropos, concerning", "Close to", "Encompassing", "Concerning; approximately", "On the subject of, approximately", "Around" and "Approximately, on the subject of".)