"Club advisor" is one of the most loosely used phrases in the private club world. It is applied to search consultants, governance facilitators, club-management firms, CPAs, attorneys, and the occasional retired GM with a contact list. They are each useful in their lane. None of them, on their own, is what a board actually needs when it says it wants a club advisor.
The role is a quiet, senior counterpart to the board, the president, the treasurer, the finance committee, and the general manager — across the multi-year decisions that shape the club. The work is most visible during the moments boards dread. It is most valuable in the long stretches between those moments, when the discipline being built quietly determines whether the dreaded moments arrive at all.