Holding tureen is complicated (6)
I believe the answer is:
tenure
'holding' is the definition.
(thesaurus)
'tureen is complicated' is the wordplay.
'is complicated' is an anagram indicator.
'tureen' is an anagram of 'TENURE'.
(Other definitions for tenure that I've seen before include "Possession of office or property" , "Length of time in office" , "Period of occupation" , "Length of time a position is held" , "Holding or property like tureen" .)