Teased for being badly dressed (6)
I believe the answer is:
ragged
This clue is a double definition.
'teased' is the first definition.
('rag' can be a synonym of 'tease')
'badly dressed' is the second definition.
'for being' is the link.
(Other definitions for ragged that I've seen before include "Played practical jokes - in tatters" , "Old and torn, clothes say" , "Dressed in torn clothes" , "being poorly dressed" , "Unkempt" .)