Being vulgar gets his rag out (6)
I believe the answer is:
garish
'being vulgar' is the definition.
('garish' can be a synonym of 'vulgar')
'his rag out' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'his'+'rag'='hisrag'
'hisrag' anagrammed gives 'GARISH'.
'gets' is the link.
(Other definitions for garish that I've seen before include "Showy, lurid" , "Gaudy and tasteless" , "Hag, sir, could be gaudy" , "Colourful in a vulgar manner" , "Overly ostentatious" .)