Standard rating (4)
I believe the answer is:
jack
I believe this is a double definition.
'standard' is the first definition.
(both can refer to a flag)
'rating' is the second definition.
(both can mean a sailor)
(Other definitions for jack that I've seen before include "Playing card; sailor" , "Lifting tool" , "Target ball in bowls" , "Car lifter" , "Card; man's name" .)