Crossword Genius

Read later about sale of oils by this trader (3,6)

Ross

I believe the answer is:

art dealer

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

'sale of oils by this trader' is the definition.
'art dealer' can be an answer for 'trader' (art dealer is a kind of trader). I am unsure of the rest of the definition.

'read later about' is the wordplay.
'about' is an anagram indicator.
'read'+'later'='readlater'
'readlater' anagrammed gives 'ART DEALER'.

Can you help me to learn more?

(Another definition for art dealer that I've seen is " one who has a gallery, maybe".)

I've seen this clue in The Irish Times.
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