As I noted above- there are various aspects of clericalism.
For the sense that the Pope used the term in that singular quote (again there are more aspects of the error- but that is not the topic here)…here is a wider part of the quote from the Vatican website - so one can see what he means in this case:
"You spoke about** clericalism**. It is one of the evils, one of the evils of the Church. But it is a “complicit” evil, because priests take pleasure in the temptation to clericalize the laity, but many of the laity are on their knees asking to be clericalized, because it is more comfortable, it is more comfortable! This is a double sin! We must overcome this temptation. The layperson must be lay, one who is baptized, with the power that comes from his baptism. A servant, but with his lay vocation, and one does not sell this, one does not bargain with it, one should not be complicit with another person… No. I am this way! Because that is my identity. I have heard this so many times in my homeland: “In my parish, you know, I have an excellent layman: he is a good organizer… Your Eminence, why don’t we make him a deacon?”. The priest’s suggestion is immediately to clericalize. Let’s make this layman… Why? Why is the deacon or priest more important than the layman? No! This is the mistake! Is he a good layman? Then let him continue and grow as such. Why treat his Christian identity lightly. In my opinion, clericalism impedes the layman’s growth. But keep in mind what I said: the two parties are accomplices in the temptation. For there would be no clericalism if there weren’t laymen who wanted to be clericalized. Is this clear? "
~ Pope Francis
w2.vatican.va/content/francesco/en/speeches/2014/march/documents/papa-francesco_20140322_associazione-corallo.html