It's about Greek character, after the usual time, to rouse (9)
I believe the answer is:
stimulate
'rouse' is the definition.
(I've seen this before)
'it's about greek character after the usual time' is the wordplay.
'about' shows that the letters should be reversed in order.
'greek character' becomes 'mu' (letter from the Greek alphabet).
'after the usual time' becomes 'late' (I've seen this before).
'its' backwards is 'sti'.
'sti'+'mu'+'late'='STIMULATE'
'to' acts as a link.
(Other definitions for stimulate that I've seen before include "fire" , "Mutilates so as to make more active" , "Rouse" , "Inspire enthusiasm" , "Excite the feelings of" .)