Approaching from two directions (6)
I believe the answer is:
stereo
'approaching from two directions' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stereo that I've seen before include "Three dimensional sound effect" , "In-depth" , "System of sound reproduction" , "Audio system, hi-fi" , "Music-playing equipment giving depth of sound" .)