I am really struggling with 20 across (Inside small residence, once more clean back of fireplace, long forgotten) - I assume 'small residence = 'res' - and 4 down (Displays seat with the one obscure spar) and help with/hints to those two would be much appreciated. I have 27 down because of the crossing entries but cannot work out the actual answer. The same applies with both 6 and 7 down, always assuming that the answer to 17 across starts with a 3 letter word from Russian for 'commune'.