Selects note in audition as fairy (5)
I believe the answer is:
pixie
'fairy' is the definition.
(pixie is a kind of fairy)
I can't explain the remainder of the clue.
(Other definitions for pixie that I've seen before include "Mischievous fairy" , "Small supernatural being in fairy tales" , "Small supernatural being in fairy tale" , "Pointy-eared dwarf" , "Supernatural being with pointed ears" .)