Colour conflict in southeastern pottery (9)
I believe the answer is:
stoneware
'pottery' is the definition.
(thesaurus)
'colour conflict in southeastern' is the wordplay.
'colour' becomes 'tone' (tone is a kind of colour**).
'conflict' becomes 'war' (war is a kind of conflict).
'in' is an insertion indicator.
'southeastern' becomes 'se'.
'tone'+'war'='tonewar'
'tonewar' going into 'se' is 'STONEWARE'.
(Other definitions for stoneware that I've seen before include "collection of pottery" , "Type of pottery" .)