In a response to a letter from Iain Wright, chair of the BEIS committee, Clark said he disagreed with the view that the appointment process for the PCA should be reopened.
In July, the committee wrote to the minister calling for him to reopen the process and choose a candidate “who can attract the confidence of tenants as well as pub companies”.
The committee held a hearing where campaigners raised concerns about a potential conflict of interest for Newby because he has worked with pubcos for property agent Fleurets.
Newby was appointed by Clark’s predecessor, Anna Soubry, in March with responsibility for enforcing the pubs code.
Clark said: “The appointment process was run in accordance with the code of practice for ministerial appointments to public bodies.
“As part of the appointment process, the panel considered whether Paul Newby has conflicts of interest that might call into question his ability to do the job and concluded he did not.”
He said the appointment brief for the job included a “desirable criteria”, which included an understanding of the pub and brewing industry. Clark said it would not have been appropriate to rule out candidates that had direct relevant experience and expertise from the sector.
A BEIS spokesperson added: “The pubs code is a landmark piece of legislation that will help pub tenants get a fairer deal and we disagree that the appointment process for the adjudicator should be reopened.
“The office of the pubs code adjudicator is up and running, publishing guidance on tenants’ new rights and fielding enquiries through its helpline and website. We would encourage anyone with a stake in the pub business to work with Paul Newby to raise the profile of the code and improve relationships across the industry.”