I thought belly up. B for bishop and an anagram of pulley.
While I’ m here, I’m stuck on 14d Ann Widdecombe finally in the shit spiteful thing. I’ve got m?a?n?s? ‘Meanness’ fits but I can’t parse it. Also 18a Lord Owen’s initial drunken drivel. I’ve got d?o?l drool or droll fits but again, can’t parse. Any help would be greatly appreciated.