Clear Select

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.2.4/jquery.min.js"></script>
<select id="profissionalFiltro">
    <option>1</option>
    <option>2</option>
    <option>3</option>
</select>
<button id="limpar">Limpar</button>

JavaScript

$("#limpar").click(function(event) {
        $("#profissionalFiltro").empty();
    });