Musk worn by revolutionary is rank (7)
I believe the answer is:
echelon
'is rank' is the definition.
(thesaurus)
'musk worn by revolutionary' is the wordplay.
'musk' becomes 'elon' (Elon Musk).
'worn by' means one lot of letters goes inside another (I've seen this in other clues).
'revolutionary' becomes 'che' (Che Guevara the Marxist revolutionary).
'elon' going around 'che' is 'ECHELON'.
(Other definitions for echelon that I've seen before include "position in society" , "Military row formation" , "Level in hierarchy" , "Level or rank of authority, upper or lower" , "Degree" .)