Thank you both - treat was about the only possibility I had found but I wasn't totally convinced. I'm not sending this in,but I hate waiting another month to find the answer!
Yes, of course you are right, factor30. I was trying to fit alis round a but now it all makes sense. I meant to put this in crosswords but I had a senior moment, even my heading (Mature Times, November) disappeared. Thanks again!
Happy to help. was only pointing it out because some posters don't realise there is a new Crossword section now- maybe they still have AB Q&P set as a favourite