Second comedian — pedant! (8)
I believe the answer is:
stickler
This clue might be a double definition.
'second comedian' is the first definition.
The answer and definition can be both people as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'pedant' is the second definition.
(I've seen this before)
Can you help me to learn more?
(Other definitions for stickler that I've seen before include "Person who insists as on protocol" , "Someone who insists on something" , "Purist" , "One who is fussy" , "Disciplinarian, martinet" .)