Elevator inventor (4)
I believe the answer is:
otis
'elevator inventor' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for otis that I've seen before include "Place of worship; side part of head" , "lift company" , "Cole Porter's miss who was "unable to lunch today"" , "Company providing lifts" , "Lift man" .)