I master new deity (7)
I believe the answer is:
artemis
'deity' is the definition.
(Artemis is an example)
'i master new' is the wordplay.
'new' indicates an anagram.
'i'+'master'='imaster'
'imaster' is an anagram of 'ARTEMIS'.
(Other definitions for artemis that I've seen before include "Twin sister of Apollo" , "Olympian figure" , "God" , "Greek goddess of hunting" , "Diana" .)