I'm ready with socially acceptable ad-lib (9)
I believe the answer is:
impromptu
'ad-lib' is the definition.
(thesaurus)
'i'm ready with socially acceptable' is the wordplay.
'ready' becomes 'prompt' ('prompt' can be similar in meaning to 'ready'**).
'with' says to put letters next to each other.
'socially acceptable' becomes 'u'.
'im'+'prompt'+'u'='IMPROMPTU'
(Other definitions for impromptu that I've seen before include "Improvised" , "Without much planning" , "Unscripted" , "Spontaneous" , "Without rehearsal or preparation" .)