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Finally decided to strip the drive train apart to find the clicky noise and discovered this... a first for me
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blimey !!!!
Good effort, that bearing is mangled. What part is it from?
BB
If that is a BB bearing i'd be taking a very good look at the axle/spindle of your cranks to check it is not damaged.
Thankfully the cranks look good, first thing I checked after seeing the bearing. I've written a pair of cranks off in the past with a seized bearing that just span on the axle..
I reckon those bearings are 2 years old and have stood up to 2K of mileage and a majority of that as a singlespeed... This was the drive side that had gone.
Chapeau!