Dubiously sell art connected to top celebrities … (7)

I believe the answer is:

stellar

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'connected to top celebrities' is the definition.
I can't tell whether this definition defines the answer.

'dubiously sell art' is the wordplay.
'dubiously' indicates anagramming the letters.
'sell'+'art'='sellart'
'sellart' with letters rearranged gives 'STELLAR'.

Can you help me to learn more?

(Other definitions for stellar that I've seen before include "Relating to the stars" , "Like highlights" , "Astral" , "Starry" , "celebrity" .)

I've seen this clue in The Times.

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