Enriched sand processed to make porcelain (7,5)
I believe the answer is:
dresden china
'porcelain' is the definition.
(I have seen 'Fine porcelain' mean 'dresden china' so perhaps 'porcelain' could also mean 'dresden china')
'enriched sand processed' is the wordplay.
'processed' is an anagram indicator.
'enriched'+'sand'='enrichedsand'
'enrichedsand' with letters rearranged gives 'DRESDEN CHINA'.
'to make' acts as a link.
(Other definitions for dresden china that I've seen before include "precious porcelain" , "Fine German porcelain" , "Fine porcelain from Germany" , "Pottery" .)