Title for Elton John (3)
I believe the answer is:
sir
'title for elton john' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for sir that I've seen before include "Baronet's title" , "Knight's prefix" , "address to teacher" , "Noble title of undesirable kind" , "Title given to baronet" .)