Mistake that’s terrible (doubly so!) (3-3)
I believe the answer is:
boo-boo
'mistake' is the definition.
(I know that boo-boo is a type of mistake)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for boo-boo that I've seen before include "Clanger" , "Mistake" .)
I've seen this clue in The Times.
Want a hint initially instead of a full solution?
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