Assessments of sailors? (7)
I believe the answer is:
ratings
I believe this clue is a double definition.
'assessments' is the first definition.
(rating is a kind of assessment)
'sailors?' is the second definition.
(British term for naval enlisted men)
'of' acts as a link.
(Other definitions for ratings that I've seen before include "chased by TV companies?" , "Members of crew" , "Rebukes" , "Appraisals of the value of" , "they matter to broadcasters" .)