She has map back-to-front (3)
I believe the answer is:
pam
'she' is the definition.
'map back-to-front' is the wordplay.
'back-to-front' says the letters should be written in reverse.
'map' in reverse letter order is 'PAM'.
'has' is the link.
(Other definitions for pam that I've seen before include "Female" , "Short girl's name" , "- Ayres, English poet" .)