More than one flashy guy passes away -- and must get buried (7)
I believe the answer is:
Here is my best explanation:
'more than one flashy guy' is the definition.
'passes away and must get buried' is the subsidiary indication.
'passes away' becomes 'dies' ('die' can be a synonym of 'pass away').
'must get buried' is an insertion indicator.
'dies' enclosing 'and' is 'dandies'.
(Other definitions for dandies that I've seen before include "Fops", "Coxcombs", "Men who pay excessive attention to their clothes", "Men who over-dress, like Beau Brummel", "bucks", "characters too trendy?", "Smartly dressed fellows like Beau Brummel", "men about town", "Men who pay too much attention to stylish clothes" and "Blades".)