Rush as a cavalryman emerges (6)
I believe the answer is:
hussar
'a cavalryman emerges' is the definition.
I can't tell whether this defines the answer.
'rush as' is the wordplay.
'rush as' can be anagrammed to 'HUSSAR'.
But, I am not clear how this is indicated.
Can you help me to learn more?
(Other definitions for hussar that I've seen before include "one often up on a charge" , "Horseman" , "Member of a light cavalry regiment" , "Soldier in a light cavalry regiment" , "Cavalryman, originally Hungarian" .)