Crossword Genius

A nobleman's book is bound to have one (5)

Ross

I believe the answer is:

title

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

'a nobleman's book' is the definition.
'title' can be an answer for 'book' (I've seen this before). I'm not sure about the 'a nobleman's' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for title that I've seen before include "Right - name - address" , "Lord, sir or doctor, say" , "Identifying name" , "headline?" , "Proprietorship" .)

I've seen this clue in The Irish News.
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