yes it may, it can be a course which is below your offer (obviously any of the courses you put in your prefs since you got your first one) or a course that is not in your preferences. But then about the enter score... is the course you wanted to get into higher than your actual enter because if it is, it will be difficult since the uni will give spots which are free but if someone else applies for an irregular offer and has a score higher than the clearly-in and has all the prerequisites, they will be chosen instead. It all really depends on how much spots they have free, many irregular are full-fee places. But if your score is above the clearly-in and fulfil all the prerequisites i assume you will have a better opportunity of entering the course than a course that you cannot meet the clearly-in.