Thanks for your help, I changed all enabled from 0s to 1' (was 3 of them). I repeated install but received the same output.
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirror.fileplanet.com
* epel: mirror.sfo12.us.leaseweb.net
* epel-debuginfo: mirror.sfo12.us.leaseweb.net
* epel-source: mirror.sfo12.us.leaseweb.net
* extras: mirror.fileplanet.com
* updates: mirror.fileplanet.com
Package clamav-0.99.2-1.el7.x86_64 already installed and latest version
No package clamd available.
Nothing to do
Cross fingers a CWP magically fixes it