Ushered her out? That’s not new! (4)
I believe the answer is:
used
'not new' is the definition.
(thesaurus)
'ushered her out?' is the wordplay.
'out?' is a deletion indicator.
'ushered' with 'her' taken out is 'USED'.
'that's' is the link.
(Other definitions for used that I've seen before include "Second-hand - not wasted" , "Was treating" , "no stranger" , "Went through" , "Exploited - not new" .)