I consider it to be a part of my role to provide advice and guidance to members, which could include clarification of the right to abstain if they are unable to decide for or against a motion. I would limit my comments to the three options, without suggesting any one over the other two. I would not offer such advice on a matter in which I was personally involved.
As a matter of interest, what difference, if any, did the Clerk's advice make to the outcome?