Priority for egotist suffering from dual personality that goes viral? (4)
I believe the answer is:
meme
'priority for egotist suffering from dual personality that goes viral?' is the definition.
The definition suggests a singular noun which matches the answer.
This is all the clue.
Can you help me to learn more?
(Other definitions for meme that I've seen before include "online phenomenon" , "Behavioural trait" , "Cultural feature passed on by imitation" , "Image etc. that spreads rapidly on the Internet" , "Often trite image" .)