The phrase "a lucidity" is correct and usable in written English.
It can be used when referring to a state of clarity or clear understanding, often in contexts related to thought, expression, or perception.
Example: "The author's writing displayed a lucidity that made complex ideas accessible to all readers."
Alternatives: "a clarity" or "a transparency".
Complex thoughts are set forth with a lucidity that conceals the depth of the intellectual analysis.
His speeches and his voluminous writing had a lucidity and bite not usually found in academic technicians.
There's a lucidity to Bechdel's work that in certain ways (economy, concision, metaphor) bears more resemblance to poetry than to the dense, wordy introspection of most prose memoirs.
But it can, and ought to, reflect upon the framework within which we consider these questions, and in doing so perhaps offer a lucidity we might otherwise lack.
The general showed "normal behaviour and a lucidity that gives the court no concern that he may not understand its questions," he said.
Even the concert's most aggressive, insistent work, Bryan Jacobs's new "Play May Shay Fay Bay," a MATA commission, had a lucidity of texture that felt, well, delicate.
The brilliance of the book is that it is written with a distracted lucidity, an attitude that fixes the parts with unclouded clarity but repeatedly experiments to see how they fit together.
All this is ingeniously done but the virtue of Zeller's play is that it shows Andre, while inhabiting a world of contradictions, capable both of a fierce lucidity and a senile cantankerousness.
It sticks to vintage prints and brings a wonderful lucidity to a persistent balance of art and humanity that is, as it is frequently described: strange, mysterious and irresistible.
Maduro stated that he found Castro had an "impressive lucidity, an impressive train of thought and exceptional wisdom".
Hunt, in her work as an actress, has a talent for lucidity, but lucid is exactly what April is not.
