Rousing song (6)
I believe the answer is:
anthem
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">rousing song</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for anthem that I've seen before include "National or religious song" , "Religious chant" , "Uplifting song -- the man (anag)" , "Uplifting music" , "Choral work" .)