Alpine song (5)
I believe the answer is:
yodel
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">alpine song</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for yodel that I've seen before include "Sing like Frank Ifield?" , "mountain air?" , "Warbling voice" , "Sing in traditional Swiss manner" , "unusual singing" .)