Potter's product sees nothing leaving comic for age (7)
I believe the answer is:
ceramic
'potter's product' is the definition.
(I've seen this before)
'nothing leaving comic for age' is the wordplay.
I cannot quite understand how this works, but
'age' could be 'era' (both can mean a long time) and 'era' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'sees' acts as a link.
Can you help me to learn more?
(Other definitions for ceramic that I've seen before include "pottery item" , "Potter's product" , "Made of clay and hardened by heat" , "Made of fired clay" , "Hard clay" .)