Demoted in caste, girl leaves India after a month (8)
I believe the answer is:
declasse
'demoted in caste girl' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'india after a month' is the wordplay.
'india' becomes 'lasse' (I am not sure about this - if you are sure you should believe this answer much more).
'after' says to put letters next to each other.
'a month' becomes 'Dec' (abbreviation for December).
'lasse' after 'dec' is 'DECLASSE'.
'leaves' acts as a link.
Can you help me to learn more?
(Other definitions for declasse that I've seen before include "stripped of social standing" , "down the social ladder" , "having lost status" , "Having fallen in social status" .)