Named mild assembly as intermediary (9)
I believe the answer is:
middleman
'intermediary' is the definition.
(I've seen this in another clue)
'named mild assembly' is the wordplay.
'assembly' indicates anagramming the letters.
'named'+'mild'='namedmild'
'namedmild' is an anagram of 'MIDDLEMAN'.
'as' acts as a link.
(Other definitions for middleman that I've seen before include "Retailer or intermediary" , "He acts between producer and consumer" , "He comes between producer and consumer" , "Go-between" , "Intermediate" .)