Make round article made of clay (7)
I believe the answer is:
earthen
'made of clay' is the definition.
(I've seen this before)
'make round article' is the wordplay.
'make' becomes 'earn' (as in making money).
'round' means one lot of letters goes inside another.
'article' becomes 'the' (the definite article in English).
'earn' enclosing 'the' is 'EARTHEN'.
(Other definitions for earthen that I've seen before include "(Of pot) made of baked clay" , "Made of baked or fired clay" , "of the soil" , "(Of a pot) made of fired clay" , "from the ground" .)