Well chaps, been rather busy but having a day off tomorrow so relaxing tonight and just had an hour on the Harpers and got 13 clues in up to now, don't get the theme yet or how exactly it works. Like you aristo, I have a word in my head for 4 down, but can't see the wordplay yet (I have the final letter from 13 across) I do have the answer to 5 down though. 2 & 7 down escape me too yet even though I have 5 & 6 letters in them respectfully.
I'll keep plodding on with it and see where I get with it before asking for help.
greedy kite, do you want me to send the email with it on to your adopted email address that I have from you last night?