How to configure ClamAV on Debian 11? (Need sample clamd.conf and correct location)

Since upgrading from Debian 9 to Debian10/11 Clamscan now runs the system out of memory immediately - instead of previously completing all scans successfully. But the /etc/clamav/clamd.conf file does not exist - nor does any clamd.conf file exist on the system. Where does this file belong? Can we create it ourselves? Where can we get an up to date sample conf file?