Does he shake people to rouse them? (8)
I believe the answer is:
agitator
'does he shake people' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'to rouse them?' is the wordplay.
I cannot quite see how this works, but
'to' is within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for agitator that I've seen before include "A good mixer, maybe" , "Got tiara for a trouble-maker" , "Organiser" , "One causing trouble" , "One stirring up (things)" .)