Brontë’s governess married him somewhere in Kent (9)
I believe the answer is:
rochester
I believe this clue is a double definition.
'bronte's governess married him' is the first definition.
(Charlotte Bronte's Jane Eyre married Mr Rochester)
'somewhere in kent' is the second definition.
(Rochester is a town in Kent)
(Other definitions for rochester that I've seen before include "Bronte character" , "Novel hero" , "Kentish Town" , "Jane Eyre accepted" , "Reader, I married him" .)