Auntie's back again (4)
I believe the answer is:
beeb
This clue might be a double definition.
'auntie's' is the first definition.
(both are nicknames for the BBC)
'back again' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for beeb that I've seen before include "BBC, familiarly" , "British Broadcasting Corporation (popularly)" , "BBC (colloq" , "BBC (informally)" , "Auntie (slang, palindrome)" .)