Point about author raised over time (5)
I believe the answer is:
tempo
'time' is the definition.
(tempo is a kind of time)
'point about author raised' is the wordplay.
'point' becomes 'opt' (I can't explain this - if you can you should believe this answer much more).
'about' indicates putting letters inside.
'author' becomes 'me' (the author of the crossword).
'raised' shows that the letters should be reversed in order (going up in a down clue).
'opt' enclosing 'me' is 'opmet'.
'opmet' reversed gives 'TEMPO'.
'over' acts as a link.
Can you help me to learn more?
(Other definitions for tempo that I've seen before include "Rhythm or speed as in music" , "Beat (music)" , "Speed or beat, musically" , "Time (music)" , "Speed at which a musical composition is to be played" .)