That buzzing/clicking you are hearing is the starter relay. It's usually caused by dips and spikes in voltage when trying to start. The power is strong enough to engage the contacts in the relay, but once the starter engages the power drops, disconnects, and repeat over and over. That = the sound you describe.
I dont doubt you are on the right path, but I have also learned to never fully trust a new battery. Just because it shows charged on the charger, doesn't mean it is good. A battery can show 12 or more volts and still be bad.
Take it in to any place that can load test it, and see if it's cranking amps match what it is rated for.
If so, then I would say that the starter may indeed be the issue. If it is grounding out internally or is binding up from a bad bearing it could act like this. However, I have often found that when this is the case, the motor simply won't turn, or turn very slowly and not cause the relay to rapid fire.
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