First to talk about a certain royal bursar (9)
I believe the answer is:
treasurer
'bursar' is the definition.
(I've seen this before)
'first to talk about a certain royal' is the wordplay.
'first to' suggests taking the first letters.
'about' becomes 'rea' (I've seen this in other clues).
'a certain' becomes 'sure' (I've seen this in another clue).
'royal' becomes 'r' (abbreviation).
The initial letter of 'talk' is 't'.
't'+'rea'+'sure'+'r'='TREASURER'
(Other definitions for treasurer that I've seen before include "Finance expert" , "position in society?" , "Fiscal officer" , "Bursar" , "Money dealer" .)