You didn't name your tank or clearo brand and type, but a head replacement is generally needed after 3 days to a week depending on the juice you vape. Count on ten heads a month when you order replacements. If you are lucky, they will last longer. Components of the juice caramelize on the wick and taste pretty nasty until you dry burn or replace the head.
Search YouTube for "dry burn atomizer" and find one that looks like your atomizer. If it uses a silica wick, you can dry burn.