Crossword Genius

Conceited, I bring in a set of books (4-9)

Ross

I believe the answer is:

self-important

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'conceited' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Another definition for self-important that I've seen is " Pompous".)

I've seen this clue in The Telegraph.
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