Backlash concerning lawsuit (8)
I believe the answer is:
reaction
'backlash' is the definition.
(I've seen this before)
'concerning lawsuit' is the wordplay.
'concerning' becomes 're' (both can mean on a particular topic).
'lawsuit' becomes 'action' (synonyms).
're'+'action'='REACTION'
(Other definitions for reaction that I've seen before include "Into care (anag)" , "Response to stimulus from creation" , "Creation found in response to event" , "In mechanics, every action has an equal and opposite one" , "Chemical change or backlash" .)