Conveniently ignored area of revolting snot build-up? Not us! (5,4)
I believe the answer is:
blind spot
'conveniently ignored area' is the definition.
The answer and definition can be both body parts as well as being singular nouns.
Perhaps there's an association between them I don't understand?
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for blind spot that I've seen before include "where one cannot see" , "source of misunderstanding?" , "Area where understanding is lacking or one is unsighted" , "Unseen area of road" , "Hazard for driver" .)