Is that lead as in a dog lead , or lead as in the element Pb?
Which quiz is it, Pechie? If it's a quiz please can you tell us the theme and explain what the 12,17 means.
If it's a crossword AB has a crossword section. We need the letter count (I assume it's not 12,17) , name of crossword and details of known letters.
You can add info just by replying to your own question
I've just realised from another thread that this is The Guardian Crossword. I think the 12 and 17 were names of composers.If you look in Crosswords someone has just asked this so an answer will be forthcoming soon.