Eric and Mac make pottery (7)
I believe the answer is:
Here is my best explanation:
'pottery' is the definition.
(I've seen this before)
'eric and mac make' is the subsidiary indication.
'and' says to put letters next to each other (I've seen this in other clues).
'make' indicates an anagram.
'eric' put after 'mac' is 'maceric'.
'maceric' is an anagram of 'ceramic'.
(Other definitions for ceramic that I've seen before include "Brittle material of baked clay", "Potter's product", "pottery item", "potty?", "Like pottery", "China", "Like e.g. bowl", "Of baked clay", "china cup, for example" and "china bowl, say".)