The phrase "a credible idea" is correct and usable in written English.
It can be used when discussing concepts, proposals, or suggestions that are believable or trustworthy.
Example: "After reviewing the research, I believe we have a credible idea for improving our marketing strategy."
Alternatives: "a plausible concept" or "a trustworthy suggestion."
But a credible idea for preserving Labour's most enduring achievement in government is desperately needed.
Herzl's reading was that the affair marked the end of a credible idea of assimilation; Marcel Proust's was that it marked the end of a credible idea of aristocracy.
But it at last has a credible idea of how to reduce Britain's 5m-strong welfare rolls, by using private firms to help people trade benefits for wages.
In a small shop on the outskirts of Vancouver, B.C., a plasma physicist and a staff of seven, armed only with a credible idea, a sprinkling of venture capital and the important-sounding name of General Fusion, thinks it can outrace the world's fusion scientists with a far cheaper and simpler reactor.
It can also create momentum that can be the fuel that keeps the spark burning and turns it into a credible idea, product or service.
"We're open to any credible idea".
This was Mr Salmond's achievement, the unionist campaign's big weakness and, more through force of personality than any credible idea, it is Mr Farage's strength, too.
Meanwhile, Chancellor Philip Hammond has said a confirmatory referendum on a Brexit deal was a "perfectly credible" idea.
That's a very credible idea these days.
Darwin's notebooks show him trying to accommodate an intellectually credible idea of God and his new theory – in many ways successfully.
Yet neither gentleman has been willing to entertain even one credible idea from the "Blob" to enable the development of a strategic vision and accompanying policy to prevent Middle East events from stealing the dream.
