Crossword setter copied and pasted some online content (4)
I believe the answer is:
meme
'pasted some online content' is the definition.
The definition suggests a singular noun which matches the answer.
'crossword setter copied' is the wordplay.
'crossword setter' becomes 'me' (referring to the person writing the clues).
'copied' says to double the letters.
'me' duplicated is 'MEME'.
'and' is the link.
Can you help me to learn more?
(Other definitions for meme that I've seen before include "Concept that spreads rapidly on the Internet" , "online phenomenon" , "Behavioural trait" , "Cultural feature passed on by imitation" , "Cultural belief that assumes a life of its own" .)