This all depends on where when and what was allegedly said. At very least it is a matter to be investigated by whoever on your council is responsible for the employment of the Clerk. If employed as a locum then you should have a contract with them or the company providing the service, specifying the terms and expectations and cancellation specifications.
For an employed Clerk you should have in the contract of employment a laid down complaints procedure for both employer and employee. This should be followed to the letter when activated otherwise the PC leaves itself wide open to claims of constructive or wrongful dismissal via industrial tribunal. First thing to do if for your employment committee to gather the facts ascertain their validity ( fact or gossip) . Keep the employee continually informed and allow them every opportunity to present their "side".
The rules are there for a reason. Use them in an ideal world they would not be needed.
Unfortunately in such cases there can be wrong on both side. Employers trying to fabricate reason to dismiss and employee seeking compensations.
It's a minefield ......tread carefully- but take your fingers out of your ears