Crossword Genius

Jeer King John? (4)

Ross

I believe the answer is:

book

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

'john?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's a link between them I don't understand?

'jeer king' is the wordplay.
'jeer' becomes 'boo' (I've seen this before).
'king' becomes 'k' (abbreviation for king in chess).
'boo'+'k'='BOOK'

Can you help me to learn more?

(Other definitions for book that I've seen before include "Hardback, say" , "Rebecca or Emma maybe" , "Show yellow card" , "Strict rules" , "Reserve - publication" .)

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