Performer's attire's fantastic (7)

I believe the answer is:

artiste

'performer's' is the definition.
(artiste is a kind of performer)

'attire's fantastic' is the wordplay.
'fantastic' indicates an anagram.
'attires' with letters rearranged gives 'ARTISTE'.

(Other definitions for artiste that I've seen before include "Tears it (anag.)" , "'Public performer, dancer or singer (7)'" , "Professional performer" , "nightclub entertainer?" , "A sitter for creative person" .)

I've seen this clue in The Guardian, The Globe and Mail and The Telegraph.

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