pendragon, 8d's been discussed. You wanted help on 13 - it's a classical reference and the clued but unentered part is straightforward - letter for left plus a "house" without the i. 20 - the clued/unentered bit has been discussed above - 2-letter word for bill, the rest being lines up (military-style) - and the last word seems to be definition (which we're not supposed to have) ...