The phrase "a clear mistake" is correct and usable in written English.
You can use it to describe an error that is obvious or easily identifiable.
Example: "It was a clear mistake to overlook the deadline for the project submission."
Alternatives: "an obvious error" or "a blatant mistake".
"This was a clear mistake from the on-site doping control officer," Troicki said.
Maingot said that showing the replay on the stadium video screens was "a clear mistake" that "will be corrected".
When I told this story to people in Athens, everyone took the repeal to be a clear mistake.
Twelve years of detention without trial have ended for three Uighur men who have left Guantánamo Bay for Slovakia, the US Department of Defense announced on Tuesday, ending a clear mistake of the 9/11 era.
He had raised his hands, palms forward, as if to say that not only would he never do that but it had been a clear mistake in the first case.
Though some dispute how serious Microsoft was at the end, Yahoo's initial rebuff looks like a clear mistake in retrospect, as its core business recently sold for $4.8 billion.
The original newspaper article states that the 'spring offensive' was announced by Kurds in Turkey rather than by the Turkish government – a clear reporting mistake.
The clear mistake made was believing the lies and presentation of serial liar Andrew Breitbart and his allies at Fox News Channel.
Fred Abrahams, a special adviser for Human Rights Watch, said the report was consistent with the alliance's refusal to acknowledge clear mistakes, and revealed a "willful decision not to look at civilian casualties".
The referee was Enrique Morea of Argentina, an impartial official with the power to correct clear mistakes.
"There were some clear mistakes, and we didn't get the calls.
