Singer's awful entrance (7)
I believe the answer is:
ingress
'entrance' is the definition.
(I know that entrance can be written as ingress)
'singer's awful' is the wordplay.
'awful' is an anagram indicator.
'singers' is an anagram of 'INGRESS'.
(Other definitions for ingress that I've seen before include "Singers provide a means of entry" , "Singers (anag.)" , "Means of access" , "Admission" , "right of entry" .)