Hi Catcharmer,
12a - 6 letter "found fault with" (as in 'moaned') + single letter "independent" + 2 letter "writer reversed/"about" - definition is Latin expression
13d - 2 letter "press release" + 2 letter "approve" + single letter "disc" + an anagram/"fabulous" of "five" - definition is the name of a "musician"
All your letters are correct.