Wonderful magazine, incompletely edited (7)
I believe the answer is:
amazing
'wonderful' is the definition.
(thesaurus)
'magazine incompletely edited' is the wordplay.
'incompletely' means to remove the last letter.
'edited' indicates anagramming the letters.
'magazine' with its last letter taken away is 'magazin'.
'magazin' is an anagram of 'AMAZING'.
(Other definitions for amazing that I've seen before include "Filling with wonder, a huge surprise" , "Unbelievable!" , "Sensational" , "Excellent; surprising" , "Causing great surprise" .)