Brings us into a complicated case (6)
I believe the answer is:
causes
'brings' is the definition.
(I've seen this before)
'us into a complicated case' is the wordplay.
'into' is an insertion indicator.
'a complicated' indicates anagramming the letters.
'case' with letters rearranged gives 'caes'.
'us' put into 'caes' is 'CAUSES'.
(Other definitions for causes that I've seen before include "Reasons why things happen" , "They give rise to effects" , "Factors" , "Origins or crusaders" , "Gives rise to -- crusades" .)