Kept out (8)
I believe the answer is:
excluded
'kept out' is the definition.
('exclude' can be a synonym of 'keep out')
This is all the clue.
(Other definitions for excluded that I've seen before include "Denied access" , "'Debarred, shut out (8)'" , "Left out" , "Kept out from place or group" , "Ruled out" .)