Sell art of the stars (7)

I believe the answer is:

stellar

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

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

'sell art' is the wordplay.
'sell art' can be anagrammed to 'STELLAR'.
But, I am not sure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for stellar that I've seen before include "Excellent - shining bright?" , "Astral" , "Wonderful" , "Top-notch" , "Star-like, with star quality" .)

I've seen this clue in The Irish News.

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