You won't find her in Memphis, Tennessee! (3)
I believe the answer is:
his
'you won't find her' is the definition.
I can't judge whether this definition defines the answer.
'in memphis tennessee' is the wordplay.
'in' indicates a hidden word.
'HIS' is hidden within 'memphis tennessee'.
Can you help me to learn more?
(Other definitions for his that I've seen before include "Belonging to the male" , "that chap's" , "It belongs to him" , "To - Coy Mistress (Marvell)" , "That man's" .)