Is the clerk under a contract of employment with a salary? If so, they're entitled to be paid, as an inquorate PC lacks the power to amend the contract. I presume that the principal authority is continuing to levy a precept on behalf of the Council, so money will still be coming in. After several years, the principal authority should have stepped in to appoint temporary councillors. Is there really nobody willing to join the Council to get it up and running again? If that's the case, it should be abolished.