Thanks, that got me on the right track. I was able to clear the cache by hooking after ProcessPageSort::execute.
public function init() {
$this->addHookAfter('ProcessPageSort::execute', $this, 'afterSort');
}
public function afterSort() {
$homePage = wire("pages")->get("template=home");
$pageRender = wire("modules")->get("PageRender");
$cacheFile = $pageRender->getCacheFile($homePage);
$cacheFile->expireAll();
}
schafdog27's post in Clear template cache on sort? was marked as the answer