We leave waitress organising apples and pears (6)
I believe the answer is:
stairs
'apples and pears' is the definition.
(Cockney rhyming slang for 'stairs')
'we leave waitress organising' is the wordplay.
'leave' is a deletion indicator.
'organising' indicates anagramming the letters.
'waitress' with 'we' removed is 'aitrss'.
'aitrss' is an anagram of 'STAIRS'.
(Other definitions for stairs that I've seen before include "Way between floors" , "4 and 8 (to the cockney)" , "Series of steps" , "Access consisting of steps" , "Ascending flight of steps" .)