To make our discussions clearer, let’s use the phrase you presented in a complete sentence like, say, this example:
“A is more likely to be clicked than B.”
This is a comparative sentence indicating that A has a greater chance or likelihood of being clicked than B. Here, the phrase “more likely to be clicked” is the comparative. It is of the form “more + adverbial phrase + verb + than” where, of course, the adverbial phrase is “likely to be” and the verb it is modifying is “clicked.”
I hope this helps clarify the structure and attribute of the phrase you presented.