The phrase "a clear instruction" is correct and usable in written English.
You can use it when referring to a specific directive that is easy to understand and follow.
Example: "The teacher provided a clear instruction on how to complete the assignment, ensuring that all students understood the requirements."
Alternatives: "a straightforward directive" or "an unambiguous guideline."
Children Will Listen, from Into the Woods, is a clear instruction to every parent but isn't in the least preachy.
What is needed is a complete kit (excluding foundation), and a clear instruction set for assembly of a home by any mechanically inclined person.
"Me and my colleagues, we were given a clear instruction: to show Donald Trump in a positive way, and his opponent, Hillary Clinton, in a negative way," he said in his speech.
The most troubling aspect, according to the evidence, of the no-aides policy is not that the Senators did not have aides, but that Chairman Gray was given a clear instruction from someone in Senator DeConcini's office to come alone.
"You're going to be the director of the F.B.I., pal!" Graham said, in a way that suggested that we were no longer living in a time in which just being told what was "wise" would be understood as a clear instruction.
However, it did receive a clear instruction to move forward on debt, including following up on the crucial work done on responsible lending and borrowing, and most importantly on creating an effective mechanism to solve debt crises in a fair, speedy and sustainable manner.
The captain was heard shouting "Pull Down," a command that investigators called "confusing" as a clearer instruction to point the nose lower and avoid a stall would be "Push Down". Instructors and automated avoidance systems use "Pull Up" to mean pulling the stick back, which can cause or deepen a stall.
"We've been clear all along that the people of the United Kingdom have given the government a very clear instruction to take us out of the European Union," he said.
"It is not to play in public worship, it is suggested for groups to listen to if they want, there is a pretty clear instruction in the book to group leaders to check out the lyrics first and to make sure that they use the version that is played on the radio, not the unexpurgated version," Bishop Croft said.
The Central Committee on Research Involving Human Subjects (CCMO), the Nationwide committee supervising al regional committees in the Netherlands, provides a very clear instruction on when to present research plans to medical ethics committees.
