Crossword puzzle clue "kind of class at sea"

Kind of class, at sea

"Class of" class

Class where you might learn about class, informally?

Second in his class in West Point's class of 1829

History class: F -- “The professor ignored my attendance record and class participation, judging me entirely on ___”

Class, level or class level

Class within a class

Russian border sea (can we still call it a sea?)