A score of 5 in any module of IELTS means that the person could mostly understand the question, but can answer in very vague terms, like circling around, but not to the point. i.e. if the question is about Rose, person is talking just about a garden in his answer.
9 bands means using english like a native speaker, 8 means handling complex language almost every time. 7 means most of the time, 6.5 means half of the times, 6 some times, 5 very few times and 5 means handling structural complex english very occasionally. 4.5 & 4 questions the user's ability to understand question.
Overall score of 4.5 is very low IMHO, but we can not answer without knowing the complete details of your case and the rules of your selected visa category.