Clerky is to filing cabinets what Psst was to blooming flowers - at least in concept. All Clerky wants to do is GOTO his favourite pub but before he can do that he must GOSUB first. The subroutine in Cierky's life is that he is a filing clerk and a low wage earner. His boss won't let him go until all the filing is done, and he won't earn enough money to afford a drink unless he works hard. Life is made worse by the flying inkpots which try to spill ink all over his shirt front and the publican (being a fusspot) won't let him into the pub if he's be splattered with ink stains. Another problem is the mad typist in the next room who keeps throwing rubbers at him.
On screen, there is a large five-drawer filing cabinet filling the left side of the screen. Clerky floats around in the blue void left, collecting the sheets of paper which are dropped randomly from six slots along the top. The object is simple, catch a paper and run it over to the cabinet. It doesn't matter which drawer you aim for, as soon as you touch any part of the cabinet one of the drawers is filled.
When all five are full you progress to the next screen. On the first, there are only two inkpots, and another is added with each progression. The inkpots dart around all over the playing area, killing Clerky off if one hits him. The rubbers enter from the right and bounce slowly along to the left at the bottom of the screen. Despite indications to the contrary in the scenario, all the game takes place in the office, none of it in the pub. Points are scored for catching a letter and double for filing it.