Trimming books, one turned to gold (6)

I believe the answer is:

bauble

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'trimming' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for bauble that I've seen before include "Small cheap trinket" , "Christmas tree decoration" , "'Bead, trinket (6)'" , "Gaudy toy" , "Showy but valueless ornament" .)

I've seen this clue in The Times.

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