Left to fit out elevator (4)
I believe the answer is:
lift
'elevator' is the definition.
(I know that elevator can be written as lift)
'left to fit out' is the wordplay.
'left' becomes 'l' (common abbreviation).
'to' is a charade indicator (letters next to each other).
'out' is an anagram indicator (out can mean wrong or inaccurate).
'fit' is an anagram of 'ift'.
'l'+'ift'='LIFT'
(Other definitions for lift that I've seen before include "Raise the vertical conveyor" , "remove" , "Free ride" , "Raise; elevator" , "Means of access to different floors" .)