Stupid man wiped out in financial failures (5)
I believe the answer is:
crass
'stupid' is the definition.
(I've seen this in another clue)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for crass that I've seen before include "Unrefined" , "Insensitively stupid" , "Grossly stupid, tactless" , "Showing gross lack of sensitivity" , "Tactless, boorish" .)