Backlash, possibly, with regard to lawsuit (8)
I believe the answer is:
reaction
'backlash' is the definition.
(I've seen this before)
'with regard to lawsuit' is the wordplay.
'with regard' becomes 're'.
'to lawsuit' becomes 'action' (synonyms).
're'+'action'='REACTION'
'possibly' acts as a link.
(Other definitions for reaction that I've seen before include "Into care (anag)" , "counter-revolution" , "Reflex; backlash" , "Response to stimulus from creation" , "Chemical change or response" .)