Be prejudiced with no front (5)
I believe the answer is:
exist
'be' is the definition.
('exist' can be a synonym of 'be')
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for exist that I've seen before include "Have objective reality" , "Get a life!" , "Be alive" , "Have being or continue living" , "Live" .)