Baroque art, pure joy (7)

I believe the answer is:

rapture

I'm a little stuck... Click here to teach me more about this clue!

'joy' is the definition.
(thesaurus)

'baroque art pure' is the wordplay.
'art pure' can be anagrammed to 'RAPTURE'.
Though, I'm not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for rapture that I've seen before include "Extreme delight" , "modified for Nanki-Poo?" , "Feeling of bliss, elation" , "Exaltation" , "transport" .)

I've seen this clue in The Telegraph.

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