Contrasting articles from Paris and London on 'love in moderation' (7)
I believe the answer is:
unalike
'contrasting articles from paris' is the definition.
'unalike' can be an answer for 'contrasting' (thesaurus). I am unsure of the 'articles from paris' bit.
'london on love in moderation' is the wordplay.
'london on' becomes 'una' (I can't explain this - if you can you should give a lot more credence to this answer).
'love in moderation' becomes 'like' (liking is not as strong as loving).
'una'+'like'='UNALIKE'
'and' is the link.
(Other definitions for unalike that I've seen before include "poor match" , "Dissimilar" , "Differing from each other" , "Not similar to one another" , "different" .)