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It’s well known: new lockdown meme no good (6,9)

Ross

I believe the answer is:

common knowledge

'it's well known' is the definition.

'new lockdown meme no good' is the wordplay.
'new' indicates an anagram.
'good' becomes 'g' (abbreviation).
'lockdown'+'meme'+'no'+'g'='lockdownmemenog'
'lockdownmemenog' anagrammed gives 'COMMON KNOWLEDGE'.

(Other definitions for common knowledge that I've seen before include "understood by all" , "generally accepted" .)

I've seen this clue in The Times.
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