Fall of rogue in lawsuit (7)
I believe the answer is:
cascade
'fall' is the definition.
(cascading is a kind of falling)
'rogue in lawsuit' is the wordplay.
'rogue' becomes 'cad' (I've seen this before).
'in' indicates putting letters inside.
'lawsuit' becomes 'case' ('case' can be a synonym of 'lawsuit').
'cad' placed into 'case' is 'CASCADE'.
'of' acts as a link.
(Other definitions for cascade that I've seen before include "Waterfall or deluge" , "Shower" , "Dramatic fall" , "Small waterfall or series of them" , "Outpouring" .)