Aha! Many thanks to both of you!
Up the Pole??? I'm sure that's correct and the way the crossword is laid out means that these two clues intersect on the O from white hole (related to a black hole I presume) and the O of pole. However, 'up the pole' is not a phrase I'm familiar with (you live and learn I suppose!). I'm sure the EU will outlaw it soon and prevent it cropping up as a bizarre crossword answer.
Thanks again,
Phil.