I master deranged deity (7)

I believe the answer is:

artemis

'deity' is the definition.
(Artemis is an example)

'i master deranged' is the wordplay.
'deranged' indicates an anagram.
'i'+'master'='imaster'
'imaster' anagrammed gives 'ARTEMIS'.

(Other definitions for artemis that I've seen before include "Olympian figure" , "Twin sister of Apollo" , "Cynthia" , "Mythical Greek huntress" , "Virgin" .)

I've seen this clue in The Daily Express.

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