Big name in vertical transport (4)
I believe the answer is:
otis
'big name in vertical transport' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for otis that I've seen before include "lift company" , "Regretful miss" , "Place of worship; side part of head" , "US inventor" , "Company providing lifts" .)