You are not going over the "clerks head" as a councillor it is your duty (and obligation) to ensure that the council receives the correct information to enable it to make correct judgements. As an employee the clerk like any other must be subject to checking that they carry out their duties as defined and to the best of their abilities or specified levels of competence. As an employer the council has again, a duty to ensure that the employee who falls short of the requirements receives whatever assistance, support or training to achieve the required level of competence. This is why they should be required to participate in clearly defined employment reviews where such matters can be identified and corrected if necessary. Councillors " protecting " an employee are failing in their duty and also failing the employee. Unfortunately this does neither the council or the clerk any favours which is why a robust employment policy needs to be in place and if possible be delegated to an employment committee