Hi
As lots of people leave the Prize til Sunday, it might not be fair to just send you the clue numbers. I started by putting in the solutions that couldn't reasonably have a synonym ( like 1 or 18 down, 10 or 27 across) The crossing letters they provide will show that you can't put in the solution you have deduced from the wordplay for other clues. I found the WP to be very fair.
13 was a new word for me but I understood what I was being asked to do and enlisted some software help. That is cheating for some, but if I learn something new, it's OK in my book!
Hope that helps you to get started!