Blunder, as might careless builder? (4,1,5)
I believe the answer is:
drop a brick
If this is the answer, I'm afraid I cannot explain it.
Can you help me to learn more?
(Other definitions for drop a brick that I've seen before include "Make a tactless remark" , "put foot in it?" .)
I've seen this clue in The Times.
Want a hint initially instead of a full solution?
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