Love story mostly about love in Paris (Eastern) (8)
I believe the answer is:
oriental
'eastern' is the definition.
('Oriental' can be a synonym of 'eastern')
'love story mostly about love in paris' is the wordplay.
'love' becomes 'o' (In tennis, 'love' means 'zero').
'story' becomes 'tale' ('tale' can be a synonym of 'story').
'mostly' means to remove the last letter.
'about' says to put letters next to each other.
'love in paris' becomes 'rien' (I am not sure about this - if you are sure you should believe this answer much more).
'tale' with its last letter removed is 'tal'.
'tal' after 'rien' is 'riental'.
'o'+'riental'='ORIENTAL'
Can you help me to learn more?
(Other definitions for oriental that I've seen before include "from E?" , "Wading bird" , "Non-European" , "Genghis Khan, say" , "from Japan, say" .)