Ah! Captain Hook,
I am intrigued with your critique of 51 Across, that's one of my clues.
I was working fast to get my 12 clues ready for print and on inspection of this clue, I can see no spelling mistake as I have kept the tense of the clue words in matching order of the tense of the answer.
Maybe... and only maybe, the first 3 words of the clue could warrant the use of "For instance" as it is an example of the answer, however, spelling mistakes, I see none.
You also have to remember Captain, that I am dyslexic (I know how to spell that now), and when mistakes are pointed out, I do take extra special notice to check them, so as to strive to get it right.
I comment on the forum regularly on my lack of expertise in the world of literature because when I was a schoolboy, I shied away from reading and tended to apply myself more on the sports field and in the sciences. It is only since my schooldays that I gained an interest in words when my father took me under his wing and taught me the magnificence of the English language and the beautiful mystery of the The Cryptic Crossword to which he himself was a legend (well, to me he was).
I do welcome any more feedback on this, in case I have completely missed something
Thanks Les40