Element dispersed in mud I brought in (6)
I believe the answer is:
indium
'element' is the definition.
(I know that indium is a type of Poor metal)
'dispersed in mud i brought in' is the wordplay.
'dispersed' indicates an anagram.
'brought in' is an insertion indicator.
'in'+'mud'='inmud'
'inmud' is an anagram of 'indum'.
'indum' enclosing 'i' is 'INDIUM'.
(Other definitions for indium that I've seen before include "Metallic element, In" , "Silvery-white metal" .)