I also felt that 3A was far too convoluted, especially as it's linked to the equally impenetrable (without crossers) 7D and 8D. The surface is terrible, too.
Incidentally, a clue in this week's Guardian Quiptic is almost identical to 20A, in almost exactly the same position in the grid, with the same answer! Do both papers still have the same crossword editor, I wonder 🤔