Philosopher on what is coming up (5)
I believe the answer is:
hegel
'philosopher' is the definition.
(Hegel is an example)
'on what is coming up' is the wordplay.
'on' becomes 'leg' (cricket term, fielding positions).
'what' becomes 'eh' (I've seen this in other clues).
'is coming up' says the letters should be written in reverse.
'leg'+'eh'='legeh'
'legeh' reversed gives 'HEGEL'.
(Other definitions for hegel that I've seen before include "German philosopher, d. 1831" , "Georg Wilhelm ---, Ger. philosopher" , "German 'dialectic' philosopher" .)