Bearing seat away (4)
I believe the answer is:
east
'bearing' is the definition.
(a compass bearing)
'seat away' is the wordplay.
'away' indicates an anagram (letters move away from their original places).
'seat' anagrammed gives 'EAST'.
(Other definitions for east that I've seen before include "On most maps it's right!" , "Sunrise direction" , "Cardinal compass point" , "Chinese, perhaps" , "Opposite of west" .)