Designations or headings (6)
I believe the answer is:
titles
This clue is a double definition.
'designations' is the first definition.
(title is a kind of designation)
'headings' is the second definition.
(I know this)
(Other definitions for titles that I've seen before include "Championships" , "Designations of honour or office" , "Identifying appellation signifying status or function" , "Lord, Lady etc." , "Names of books or lords" .)