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Mampara: Although MELCHITES are also Syrian Christians, the 'C' conflicts with 4 DOWN, for which I hve ABAS - Kayakamina would agree with this solution I think? Perhaps Kayakamina can see the wordplay in MARDAITES - presuming MS refers to OLD WRITINGS, but ARDAITE is a chemical, so doesn't make sense. Sorry, Kayakamina, but I can't see that MONDAINES 'women belonging to fashionable society' have anything to do with Christian sects. So I'm back to TOR_(4) for 2 DOWN.
Rather than pencil, I've used a lot white-out this week!