Goddess who enchants occasionally by movie's finale (6)
I believe the answer is:
hecate
'goddess' is the definition.
(thesaurus)
'who enchants occasionally by movie's finale' is the wordplay.
'occasionally' indicates alternate letters.
'by' says to put letters next to each other.
'finale' indicates one should take the final letters.
The final letter of 'movie' is 'e'.
'who'+'enchants'='whoenchants'
The alternate letters of 'whoenchants' are 'hecat'.
'hecat'+'e'='HECATE'
(Other definitions for hecate that I've seen before include "Divine witch" , "evil witch" , "Female with spells" , "Greek goddess associated with witchcraft and the ghost world" , "Greek goddess of the Underworld" .)