Doctor to reveal way of getting to the top? (8)

I believe the answer is:
elevator
'way of getting to the top?' is the definition.
I can't tell whether this definition defines the answer.
'doctor to reveal' is the wordplay.
'doctor' indicates anagramming the letters.
'to'+'reveal'='toreveal'
'toreveal' with letters rearranged gives 'ELEVATOR'.
Can you help me to learn more?
(Other definitions for elevator that I've seen before include "North American lift" , "I go up" , "Lifting device" , "one that goes up and down" , "Cage that is raised and lowered mechanically in a vertical shaft" .)
