The phrase "a clear assertion of" is correct and usable in written English.
It can be used when you want to emphasize a definite statement or claim about a particular subject or idea.
Example: "The report provides a clear assertion of the company's commitment to sustainability and environmental responsibility."
Alternatives: "a definite statement of" or "an unequivocal claim of".
In his famous book "Mere Christianity," adapted from a series of BBC radio talks during World War II, Lewis laid out a clear assertion of what it meant to be Christian.
The size of the penalty, which surprised lawyers and legal experts, was a clear assertion of the power of the European Commission and its main antitrust regulator, Neelie Kroes, who is its competition commissioner.
It is time to return to our roots.' Mr Major began his speech with a clear assertion of his personal leadership of the Conservative Party, joking that as he walked around the Winter Gardens in Blackpool, he saw 'memoirs to the left of me, memoirs to the right of me, memoirs in front of me.
This, too, would be a good sign, a very clear assertion of where his priorities will lie.
From all corners of the gym, frustrated parents voiced support for a clear-cut assertion of authority.
Mr. Tucci's clearest assertion of control occurred two weeks ago, when he announced a reorganization dividing the company into three groups and reducing the role of Moshe Yanai, the longtime champion within the company of Symmetrix.
New Start was the last major challenge of the session for Mr. Obama, and in some ways it was the clearest assertion of his authority in the face of an emboldened Republican Party.
That is a clear factual assertion that I am guilty of forgery, a serious crime that goes directly to the heart of my reputation -- as a businessman, marketer and entrepreneur.
"Without a clear and definitive assertion of copyright claims by faculty, the universities will usurp such rights by default".
We believe that the use of a summary annotation would be of great benefit, by allowing to have a clear overview of an assertion, taking into account all evidence lines.
