GK I didn't see it, but I think it was explained somewhere. Anyway, thank you for the explanation and I'm never insulted by kind people helping me. I've only been doing cryptics for a few months. The clue is brilliant but I doubt I ever would have got it!
Pastille Thank you for your good wishes.
Am off to buy The Times and get going on the Jumbo. Or rather, wait until there are a few answers on here and then try.
xR