For example, lady is filling box having discarded wrapping (6)
I believe the answer is:
aristo
'for example lady' is the definition.
(lady is a type of aristocrat)
'is filling box having discarded wrapping' is the wordplay.
'filling' is an insertion indicator.
'box' becomes 'carton' (carton is a kind of box).
'having discarded wrapping' indicates the central letters (letters which wrap the word are removed).
The centre of 'carton' is 'arto'.
'is' placed into 'arto' is 'ARISTO'.
(Other definitions for aristo that I've seen before include "Toff" , "Owned by the state" , "Nob" , "privileged individual" , "one of the best" .)