This person, getting cloned, is an internet hit (4)
I believe the answer is:
meme
'this person getting cloned is an internet hit' is the definition.
The definition suggests a singular noun which matches the answer.
'this person getting cloned' is the wordplay.
'this person' becomes 'me' (I've seen this in other clues).
'getting' is a charade indicator (letters next to each other).
'cloned' becomes 'me' (I can't explain this - if you can you should give a lot more credence to this answer).
'me'+'me'='MEME'
Can you help me to learn more?
(Other definitions for meme that I've seen before include "online phenomenon" , "Cultural belief that assumes a life of its own" , "Often trite image" , "Cultural feature passed on by imitation" , "Image etc. that spreads rapidly on the Internet" .)