Berry or Olin (3)
I believe the answer is:
ken
'berry or olin' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ken that I've seen before include "Identify; -- Livingstone" , "Understanding - boy's name" , "Awareness" , "Know; man's name" , "One's range of knowledge" .)