New arts supremo (4)

I believe the answer is:

tsar

'supremo' is the definition.
(I've seen this before)

'new arts' is the wordplay.
'new' indicates an anagram.
'arts' with letters rearranged gives 'TSAR'.

(Other definitions for tsar that I've seen before include "Russian leader" , "Old Russian ruler" , "Old Russian 22" , "Title given to the kings of Bulgaria" , "Nicholas II was the last" .)

I've seen this clue in The Daily Express and The Mirror.

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