Ordinary seaman’s evaluation (6)
I believe the answer is:
rating
I believe this is a double definition.
'ordinary seaman's' is the first definition.
(I've seen this before)
'evaluation' is the second definition.
(I know that evaluation can be written as rating)
(Other definitions for rating that I've seen before include "Score" , "Sailor - assessment" , "Rank - sailor" , "Salt" , "Seaman; class" .)