Insert the following code, in functions.php
of your child theme.
function wpse_excerpt_for_specific_category( $excerpt ) {
global $post;
$category = 'Test'; // could be name, slug, or id
$excerpt_text="some arbitrary text";
if( 'post' == $post->post_type && 'publish' == $post->post_status && in_category( $category ) ) {
$excerpt = $excerpt_text;
}
return $excerpt;
}
add_filter( 'get_the_excerpt', 'wpse_excerpt_for_specific_category' );
Done.
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