Woman’s low voice range changes a lot (4)
I believe the answer is:
alto
'woman's low voice range' is the definition.
I can't tell whether this definition defines the answer.
'changes a lot' is the wordplay.
'changes' indicates an anagram.
'a'+'lot'='alot'
'alot' anagrammed gives 'ALTO'.
Can you help me to learn more?
(Other definitions for alto that I've seen before include "Second of four parts (in singing)" , "Member of choir" , "someone to sing" , "Male singer" , "Key old > male who scores high" .)