Re: Restricting field access for reports by user

You can go to that fields settings and use the "Restrict access by role" in the permissions section. Set that role to have no access to that field and it will disappear from their reports. Just make sure they really do not need access to that field for anything else.

Edit: sorry it was really early and I should have read further, this will help for role but not by user obviously. I will still leave it here in case it has any value to you.