A Parisian died to save earth, though no longer worshipped (9)

'no longer worshipped' is the definition.
The answer and definition are not the same part of speech. However, past participle verbs and adjectives sometimes define each other.

'a parisian died to save earth though' is the wordplay.
'a parisian' becomes 'un' ('a' in French).
'to save' is an insertion indicator.
'earth' becomes 'E'.
'though' becomes 'if' (I've seen this in other clues).
'e'+'if'='eif'
'died' going around 'eif' is 'deified'.
'un'+'deified'='UNDEIFIED'

Can you help me to learn more?