I've manged to fill the grid and got the instruction from the across clues. My significant problem at the moment is finding the five words to be removed in the down clues. Is there one in 2 down?
My five letter extra word is the final one (in clue order) that I have currently found. I cannot see how to interpret (yet) the five extra words - are they in the correct order?
I've not had a chance to start this one yet, but I see it's a carte blanche. Just a reminder that, although bars and clue numbers must not be shown in the grid, if anyone wants to explore how bars and clue numbers might nevertheless work it is possible that this may be handy: https://codepen.io/dcwarwick/full/wvdebxB. Remember to set the grid to 13x12 (cos I didn't!) and the symmetry to 180° rotational.