Magnificent tree planted by newspaper employee (7)
I believe the answer is:
sublime
'magnificent' is the definition.
(thesaurus)
'tree planted by newspaper employee' is the wordplay.
'tree' becomes 'lime' (lime is a kind of tree).
'planted by' says to put letters next to each other.
'newspaper employee' becomes 'sub' (sub is the subeditor of a newspaper).
'lime' after 'sub' is 'SUBLIME'.
(Other definitions for sublime that I've seen before include "Magnificent" , "Heavenly" , "Awe-inspiring - exalted" , "Transcendent" , "Wonderful" .)