Piece of primitive art, hysterically coarse (6)
I believe the answer is:
earthy
'coarse' is the definition.
(synonyms)
'piece of primitive art hysterically' is the wordplay.
'piece of' says the answer is hidden in the clue.
'EARTHY' is hidden in the letters of 'primitive art hysterically'.
(Other definitions for earthy that I've seen before include "Suggestive of soil" , "Crudely uninhibited" , "Blue" , "Lusty, coarse" , "Natural" .)