Score for a seaman (6)
I believe the answer is:
rating
I believe this is a double definition.
'score' is the first definition.
(I've seen this before)
'for a seaman' is the second definition.
(British term for a naval enlisted man)
(Other definitions for rating that I've seen before include "Seaman; class" , "Lowly naval rank" , "rebuke?" , "Classification assigned to person as, say, for income" , "Classification; seaman" .)