Clicking noises are just about the hardest to diagnose. Do a search hear for Bottom bracket, click or creak.

The first steps in pinning it down are to identify a pattern, if any, such as once per crank revolution, only on certain chainrings, only when standing, climbing, sprinting, etc. The more specifics you can supply, the easier it is to winnow down possibilities. Then it's process of elimination.

For all BB creaking or clicking, I always start by eliminating the pedals. Remove the pedals, and replace with another pair, preferably non-clipless or even rubber pedals, and see if anything changes. if not, you;ve eliminated the pedals, and shoe cleats, and can get down to the tough stuff.