Singers (5)
I believe the answer is:
altos
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">singers</span>' is the definition.<br/ ><span class="explanation-format__explanation">(alto is a kind of singer)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for altos that I've seen before include "Females who sing in the lowest range" , "Singers" , "High male or low female voices" , "Highest male, lowest female, voices" , "Choir members" .)