Very rare comic (9)
I believe the answer is:
priceless
'very rare comic' is the definition.
Both the answer and definition are adjectives. Perhaps there's an association between them I don't understand?
This is all the clue.
Can you help me to learn more?
(Other definitions for priceless that I've seen before include "Very precious; absurd" , "Invaluable - very funny" , "Wonderful" , "of inestimable worth" , "Rich" .)