Leaders for reasons obscure bankrupt firm (6)
I believe the answer is:
robust
'firm' is the definition.
Both the answer and definition are adjectives. Perhaps there's a link between them I don't understand?
'leaders for reasons obscure bankrupt' is the wordplay.
I cannot really see how this works, but
'bankrupt' could be 'bust' (I've seen this before) and 'bust' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for robust that I've seen before include "Having a strong constitution" , "Vigorous and hearty" , "Stout" , "Sturdily built" , "Hardy and vigorous" .)