Help needed , weird clicking sound while engine is running

[jakehud]

Recently bought back my racing blue clio 182 and started it today and it made this noise , it isn’t dependent on revs as does it while driving and idle and no increase in frequency just stays random

 

[JamesBryan]

Never heard that before.

Sounds pretty solid though, maybe the AC clutch trying to kick in?

Watch the aux belt and see what it's doing.