The phrase "a certain professional" is correct and usable in written English.
It can be used when referring to a specific but unnamed professional, often to imply a level of expertise or authority without disclosing their identity.
Example: "During the meeting, a certain professional shared insights that changed our approach to the project."
Alternatives: "an unnamed expert" or "a specific specialist".
It was always just the self-imposed goal to reach a certain professional level".
As an organization the Academy requires its members to have achieved a certain professional status before they may join.
After Hayes was found guilty, Green wasted little time in admitting there was a "certain professional satisfaction" over the conviction.
— Ms. Placek, Johns Hopkins University Students often choose a major a because they think it will lead them into a certain professional field.
Ethical dilemmas are no longer going to be decided solely by those who wear certain clothing and who have a certain professional pedigree.
Another is that Roach's refusal to withdraw, at least completely, his prediction of a quick and comprehensive victory carried a certain professional significance.
Then, in May 2014, the Duma passed a law requiring that certain professional classes of foreigners seeking work permits in Russia pass a Russian-language and culture exam.
In a nutshell, unless it's a social faux pas to be showing cleavage (such as at a funeral or in certain professional settings) or you don't enjoy showing cleavage, then no.
Volunteer Opportunities - Volunteer opportunities can present a unique way for an staff member to develop certain professional skills.
In addition to adjusting the threshold to inflation, the study further recommends the agency consider creating new ways to qualify as an accredited investor, including obtaining certain professional credentials, demonstrating investment experience or even passing a kind of accredited investor exam.
Accreditation requires a police force to follow certain professional guidelines in virtually all areas of police work, from crime investigations to community relations.
