Be aware policy expert will take different direction (4)

I believe the answer is:
know
'be aware' is the definition.
(I've seen this in another clue)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for know that I've seen before include "Understand" , "Be familiar with" , "Realise" , "Recognize" , "Ken" .)