Sunray, I am stuck on 12 down, give me a hint? I have N?s?le
Full clue is - Start rooting for starting a puzzle a little earlier.
Also stuck on 15a otherwise done - and fun.
Lumen, 15 A is just another word for a centrefold - the answer seems a dated concept now! There's a three-letter word for 'dog' with an two letter word relating to 'inside inside'. You've got one letter wrong in 12 D - probably because you've used a more British version for 16 A! If you change that, you'll probably see the answer instantly!