Thanks for all the info on this forum. I had probably 6 or 7 unparsed before coming here.
Still got 20d to work out though. One of my favourite words!
I see the “question of motive” which “consumes” three letters, the first of which I can see could be the “one”, but what are the other two letters? Must be the “writing fantasy “ bit of the clue but I can’t see how .
Rather late to the party so maybe noone will see this post…