"The Name of the Rose" writer Umberto (3)
I believe the answer is:
eco
'the name of the rose writer umberto' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for eco that I've seen before include "Environmental group" , "Umberto --, Italian writer" , "Umberto - - , novelist" , "Green prefix" , "Concerned with the environment" .)