"Dapper" dresser (3)
I believe the answer is:
dan
'dapper dresser' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for dan that I've seen before include "Jacob's fourth son" , "book (abbreviated version)" , "Skill level in judo" , "Expertise level in juso" , "Proficient combative sportsman" .)