Large antelope chasing bat over plateau (9)
I believe the answer is:
tableland
'plateau' is the definition.
('tableland' can be a synonym of 'plateau')
'large antelope chasing bat over' is the wordplay.
'large' becomes 'l'.
'antelope' becomes 'eland' (eland is a kind of antelope).
'chasing' is a charade indicator (letters next to each other).
'over' says the letters should be written backwards.
'bat' back-to-front is 'tab'.
'l'+'eland'='leland'
'leland' put after 'tab' is 'TABLELAND'.
(Other definitions for tableland that I've seen before include "Broad high plateau" , "Elevated area" .)