Firstly, if you wrote to the Clerk and she didn't reply, you should write again and ask her to reply. However, if providing advice to members of the public is not in her job description, she is within her rights to respond that she has chosen not to respond.
It matters not who drafted the letter. The clerk must assume responsibility for official correspondence issued under her signature. From the details you have provided, it seems that the clerk was expressing a personal opinion, based on common sense. I see nothing wrong with that, but would welcome other people's opinions.