Crossword Genius

Make an embarrassing blunder (4,1,7)

Ross

I believe the answer is:

drop a clanger

(Other definitions for drop a clanger that I've seen before include "Blunder seriously" , "Say something tactless - make stupid blunder" , "Be indiscreet" , "Make a conspicuous mistake" , "Make a big slip" .)

I've seen this clue in The Guardian.
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