A clockwork book can be found in the bookcase of a player owned house. It is given to you by Larry during the Cold War quest.
The book itself contains notes and instructions on making clockwork toys and a note from Larry on how to make the penguin suit. It is needed if you wish to build the penguin suit in Cold War.
If you lose the clockwork book you can get another one from Larry at Ardougne Zoo.
Making a clockwork toy is a very simple and good place to start for new crafters. Simply create a clockwork mechanism on your Crafting table, then use it and a wood plank to make a toy soldier or doll. Wind them up and watch them go!
It would be simple to alter the design by adding a piece of silk to the wooden frame and clockwork mechanism. You could make a suit that could be controlled from the inside.