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Big thanks to Phi for a quite outstanding puzzle with so many great elements:-)

Nice puzzle. Fairly straightforward and once the theme is cracked, a lot fills itself in. But I can't see why 12a is what it is.... how do we justify the central letter?
I seem to be able to log in from my PC but not my phone, BTW.

Lumen,
re 12a, The central letter + the extra letter is an abbreviation of a Latin word for 'wife'