Crossword Genius

Machinery essential for the bookmaker! (8,5)

Ross

I believe the answer is:

printing press

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'machinery' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's an association between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Another definition for printing press that I've seen is " Gutenberg's invention".)

I've seen this clue in The Irish Independent.
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