The phrase "to advise one's clients" means to give guidance or recommendations to a person or group who is relying on your expertise and experience to make informed decisions. Full definition
The company consists of 15 staff and are focused on advising their clients on how to reach audiences, engage customers, build brand profile and sell products. (inspiringinterns.com)
Another focus is on advising our clients in internal investigations and on compliance issues. (mofo.com)
Our lawyers also advise clients on obtaining grants as well as compliance issues that arise under federal government grant programs. (morganlewis.com)