Singer's asset (5)
I believe the answer is:
'singer's asset' is the definition.
(I've seen this in another clue)
This is the entire clue.
(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" .)