Goddess, essentially mobile? (10)
I believe the answer is:
persephone
'goddess' is the definition.
(thesaurus)
'essentially mobile?' is the wordplay.
'essentially' becomes 'per se' (I've seen this in another clue).
'mobile?' becomes 'phone' (mobile is a type of phone).
'perse'+'phone'='PERSEPHONE'
(Other definitions for persephone that I've seen before include "Infernal woman" , "Girl away all winter" , "Divine queen" , "Daughter of Demeter abducted by Pluto" , "#The wife from hell" .)