First to talk about a more certain bursar (9)
I believe the answer is:
treasurer
'bursar' is the definition.
(I've seen this before)
'first to talk about a more certain' is the wordplay.
'first to' suggests taking the first letters.
'about' becomes 'rea' (I've seen this in other clues).
'a more certain' becomes 'surer' (I've seen this in another clue).
The initial letter of 'talk' is 't'.
't'+'rea'+'surer'='TREASURER'
(Other definitions for treasurer that I've seen before include "Financial assets manager" , "Book-keeper" , "Official in charge of finances" , "Finance expert" , "position in society?" .)