Crossword Genius

Pretentiously posh (2-2-2)

Ross

I believe the answer is:

la-di-da

(Other definitions for la-di-da that I've seen before include "Stuck-up" , "Affectedly genteel" , "Informally, having affected manner of pronunciation" , "Hoity-toity" , "Pretentious, snobbish" .)

I've seen this clue in The Guardian and The Telegraph.
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