Horribly uncharitable when CERN members leave, as usual (8)
I believe the answer is:
habitual
'usual' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for habitual that I've seen before include "Chronic" , "Customary, regular" , "Done regularly and repeatedly" , "Done constantly or regularly (8)" , "Regular, usual" .)