Designer redesigning the Arctic (9)
I believe the answer is:
architect
'designer' is the definition.
(I know that designer can be written as architect)
'redesigning the arctic' is the wordplay.
'redesigning' indicates anagramming the letters (I've seen 'redesigned' mean this).
'the'+'arctic'='thearctic'
'thearctic' anagrammed gives 'ARCHITECT'.
(Other definitions for architect that I've seen before include "Wren perhaps" , "Perhaps Scott" , "professional" , "Author" , "Designer of buildings" .)