Constant bearing (7)
I believe the answer is:
abiding
This clue is a double definition.
'constant' is the first definition.
(I've seen this in another clue)
'bearing' is the second definition.
('abide' can be a synonym of 'bear')
(Other definitions for abiding that I've seen before include "Durable, lasting" , "Putting up with: long-lasting" , "bearing" , "Remaining or residing" , "Stopping" .)