The phrase "a far more stringent" is correct and usable in written English.
It can be used when comparing the level of strictness or severity of one thing to another, indicating that it is significantly more strict.
Example: "The new regulations are a far more stringent approach to environmental protection than the previous ones."
Alternatives: "much stricter" or "considerably more rigorous".
A far more stringent and enforceable set of controls on nuclear equipment exports is urgently needed.
"There's a far more stringent standard of parenting these days, with a lot invested in a child's success.
Add to that a far more stringent language test now to be imposed on foreign nurses, and many fewer may come.
Phelps has certainly faced down innumerable allegations over the years, something he did by volunteering to be tested at a far more stringent level than the World Anti-Doping Agency requires.
After that, he did no further work at Machu Picchu, and the material he excavated elsewhere in Peru was subject to a far more stringent 1916 loan agreement of 18 months.
For Republicans, it means doing only those things that legislators of both parties can agree on — a far more stringent standard, and one that would produce a very different bill.
But their successor will take office at a time of far more stringent federal regulation of Wall Street and the environment, leaving fewer opportunities for the attorney general to leap into the breach.
But a "fiduciary" has far more stringent responsibility.
Forcing funds to disclose short positions if they exceed 0.25% of the capital of a company in a rights issue is far more stringent than the obligations long positions face and probably bureaucratic too.
Ultimately, "Kate Plays Christine" subjects the very status of dramatic representation to a severe moral and aesthetic test, one far more stringent and comprehensive than a mere comparison of the factual record to the elements of fiction.
With the connivance of its willing handmaidens and cronies in Washington and elsewhere -- including the ostensibly upright United Automobile Workers -- the S.U.V. is officially classified as a "light truck," a baldfaced whopper meant specifically to duck the far more stringent rules governing passenger car design, equipment and performance.
