Entangle; complicate (7)
I believe the answer is:
involve
This clue is a double definition.
'entangle' is the first definition.
(I know this)
'complicate' is the second definition.
(I know this)
(Other definitions for involve that I've seen before include "Consist of, or include" , "Rope in" , "Cause participation of (someone)" , "Concern" , "Embroil" .)