Drawer opened by a teacher (8)
I believe the answer is:
educator
'teacher' is the definition.
(someone who educates)
'drawer opened by a' is the wordplay.
I cannot really understand how this works, but
'by' could be 'at' and 'at' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for educator that I've seen before include "Instructor" , "coach" , "Trainer, teacher" , "One who teaches others" , "master, say" .)