He should have said he stood up to have a stretch, and his hands came together accidentally.
Oh what are Labour doing? The Tories are too busy having a civil war about Brexit to do much else. This could have been Labour's chance to shine, but instead they've got their own big internal problems, and can't decide what their own version of Brexit would look like. It seems that UK politics is like a boxing match where both boxers are on the ropes.
Labour have agreed at their conference to not leave any option off the table regarding Brexit (seat on the fence, anyone?). But if they've got something to say or propose, they'd best hurry up. It's happening in March next year.