Byron or Tennyson (4)
I believe the answer is:
lord
'byron or tennyson' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lord that I've seen before include "Member of the aristocracy" , "Entitled" , "Until 2006 the presiding officer of the House of Lords and head of the judiciary" , "Feudal superior" , "Titled nobleman" .)