Right caption (5)
I believe the answer is:
title
I believe this clue is a double definition.
'right' is the first definition.
(title is a kind of right)
'caption' is the second definition.
(I've seen this before)
(Other definitions for title that I've seen before include "Right - name - rank" , "Designation of honour, rank or office" , "Rank < deed" , "Name of, eg, book" , "Lord, sir or doctor, say" .)