4 down
Quartet
playing
best
performance?
That’s
made-up
propaganda
(8)
Quartet playing best performance? That’s made-up propaganda (8)
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The definition is at the end of the clue.
How the clue works
The definition is made-up propaganda, referring to Newspeak, the artificial propaganda language from Orwell's 1984. The four compass points N, E, W, S form NEWS (the 'quartet'), followed by PEAK meaning 'best performance', giving NEWS+PEAK.