Why is my front crank clicking/creaking?
Look at the front shifter metal cage. Is the chain touching it? It is the most likely problem. It may be more apparent with certain gears  in the rear than with others.

If yes, shift to the middle in the back. Try to turn the barrel adjuster on your left shifter one way and back. Does the noise change? It should and you should be able to find a position where it does not rub. 

After doing that you may need to adjust the limit screws for the inner and the outer chainring.