Conspicuous mistake (7)
I believe the answer is:
clanger
(Other definitions for clanger that I've seen before include "A slang blunder - drop it" , "Stupid mistake" , "Bell possibly" , "noise that rings in the ear" , "error" .)
I believe the answer is:
clanger
(Other definitions for clanger that I've seen before include "A slang blunder - drop it" , "Stupid mistake" , "Bell possibly" , "noise that rings in the ear" , "error" .)