Level in a hierarchy (4)
'level in a hierarchy' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rung that I've seen before include "Telephoned" , "Ladder's step" , "spoke" , "Level in a hierarchy" , "Tolled - step on ladder" .)
(Other definitions for rank that I've seen before include "Grade; foul" , "position in forces" , "Not qualified to give order" , "Highly disagreeable" , "Row, class" .)
(Other definitions for echelon that I've seen before include "position in society" , "series of steps" , "Grade or level" , "Staggering display of military" , "Military row formation" .)