It is possible that Thomas was a kinsman of John Clerk†, the weaver who represented Reading in the Parliament of 1414 (Apr.), served as mayor in 1414-15 and was still living in 1427,
Clerk took an active part in the affairs of Reading from 1433, when he was elected cofferer, until 1466, his final mayoralty. He frequently provided pledges for the admission of newcomers to the guild, doing so at least nine times in this period, and among those whom he sponsored in this way was William Pernecote*, a fellow draper, and the landowner Thomas Beke*.
Although Clerk’s second mayoralty ended at Michaelmas 1461, and he was not one of those then nominated to serve in the next term, it would appear that he carried on in office when John West obtained a royal writ to obtain a discharge, even though this action was held to be against the custom of the borough. This meant that it was Clerk who was later held responsible for the loss of the writ de expensis for the payment of the wages of Beke and Pernecote, Reading’s representatives in the Parliament which met in November that year. In January 1463, when the two MPs had still not been paid (as the money could not be levied without the authority of a writ), it was decided in a meeting at the guildhall that Clerk should purchase a replacement writ or else pay all the wages himself.
In the course of his life Clerk had been engaged in several transactions relating to property in Reading. In Trinity term 1447 he and his first wife had conveyed two messuages and two acres of land to William Baron* esquire, the Exchequer official,
