Underworld boss losing millions in stock exchange crash perhaps (8)
I believe the answer is:
disaster
'stock exchange crash perhaps' is the definition.
I can't tell whether this defines the answer.
'underworld boss losing millions' is the wordplay.
'underworld boss' becomes 'dis' (Roman god of the underworld).
'losing millions' becomes 'aster' (I can't justify this - if you can you should give a lot more credence to this answer).
'dis'+'aster'='DISASTER'
'in' is the link.
Can you help me to learn more?
(Other definitions for disaster that I've seen before include "complete failure" , "Event causing great damage" , "Catastrophe, tragedy" , "Heavy blow" , "awful situation" .)