Singer's asset (5)
I believe the answer is:
range
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">singer's asset</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for range that I've seen before include "Number of items in a series" , "Aga or mountain, perhaps?" , "Cowboy song 'Home on the . . . . .'" , "1 across [CLASSIFY]" , "Amplitude" .)