If you mean a cheat, no, there isn't.
However, if you are in the Slavery civic, enabled by the Bronze Working technology, you can 'whip' (remove) some of your city's population to hurry a unit or building to completion in one turn. However, you need a certain amount of population (determined by how many hammers you need to finish the unit/building) in order to do so. Simply enter the City Manager (double-click on the city) and hit the 'Use Slavery' button (next to the mini-map).
You can also chop forests with a Worker, giving you (IIRC) 30 hammers before the Mathematics tech, and 44 hammers after towards the item currently being built. However, you must have the Bronze Working technology to do so.