Out of the box, I got this error and haven't been able to change the
behavior:

Apr 22 10:35:42 mcq amavis[22581]: (22581-01) (!)connect to
/run/clamd.scan/clamd.sock failed, attempt #1: Can't connect to a UNIX
socket /run/clamd.scan/clamd.sock: Permission denied
Apr 22 10:35:42 mcq amavis[22581]: (22581-01) (!)ClamAV-clamd: All attempts
(1) failed connecting to /run/clamd.scan/clamd.sock, retrying (2)

A Fedora 38 Amavis+ClamAV setup does not use "ClamAV-clamd" but "ClamAV-clamdscan" inside [1], which works out-of-the-box with the clamd@amavisd service in my local test.

[1] /etc/amavisd/amavisd.conf