Embarrassing error; crusty white bread (7)

I believe the answer is:

bloomer

(Other definitions for bloomer that I've seen before include "Big mistake" , "Stupid error (colloq.)" , "A slangy blunder or flower in blossom" , "Loaf of bread" , "Mistake (colloq.), loaf" .)

I've seen this clue in The Guardian.

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