Resigns after disturbing admission (7)
I believe the answer is:
ingress
'admission' is the definition.
(I've seen this before)
'resigns after disturbing' is the wordplay.
'after disturbing' indicates anagramming the letters.
'resigns' with letters rearranged gives 'INGRESS'.
(Other definitions for ingress that I've seen before include "Singers provide a means of entry" , "Ribbon-like pasta" , "going in" , "Entrance, access" , "The act of entering" .)