The phrase "of certain professions" is correct and usable in written English.
You can use it to refer to a subset of professions that are related in some way. For example, "People of certain professions, such as lawyers and doctors, often have higher incomes than the average worker."
Members of certain professions like the news media are naturally attuned to the workings and language of politics.
Rather than a youthful rite of passage, zero-hours contracts and low pay are now a regular feature of certain professions well into people's 30s.
Ditto the ritual of certain professions, for example the passing-the-port-type dinners that are a requirement to qualify as a barrister – a pointless anachronism that bears no relation to the pursuit of justice.
Worst, at times, they have a much distorted picture of certain professions and career paths, e.g., engineering professions, which they associated with masculinity (and thus loss of femininity).
They also have led to the demise of American and European manufacturing, so much so that some types of factories are now entirely extinct there, and workers of certain professions have ceased to exist.
There was "no evidence", it said, for the claim that "if MPs' pay does not keep up with that of certain professions, or senior roles in the public sector, we risk Parliament returning to the Victorian era, when the majority of MPs were independently wealthy".
House Republicans, some of whom had received generous campaign contributions from lenders in the past, derided parts of the legislation — particularly the forgiveness of loans for certain professions — as a form of socialism.
Speaking about the mismatch between the number of people training for certain professions and the number of jobs available, the spokesman said the government recently announced it would provide more information to students about their local job market so they could make "informed choices".
A phased increase in retirement ages and the elimination of special privileges for certain professions will come into force in 2013 as part of a radical pension reform.
For each complete year of service in certain professions, a percentage of the balance of Perkins loans may be canceled.
The cultivation and maintenance of specialized types of language by certain professions should not be regarded as trivially or superficially motivated.
