Restyle complex shortly (7)
I believe the answer is:
tersely
'shortly' is the definition.
(thesaurus)
'restyle complex' is the wordplay.
'complex' is an anagram indicator.
'restyle' is an anagram of 'TERSELY'.
(Other definitions for tersely that I've seen before include "In a short and concise manner" , "In an abrupt manner" , "using few words" , "In a short or curt manner" , "Abruptly" .)