Chivalrous don could cite about nine (7)

I believe the answer is:

quixote

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

'chivalrous don' is the definition.
'quixote' can be an answer for 'don' (Don Quixote, Spanish novel). I am unsure of the 'chivalrous' bit.

'cite about nine' is the wordplay.
'cite' becomes 'quote' (synonyms).
'about' indicates putting letters inside.
'nine' becomes 'IX' (roman numeral).
'quote' enclosing 'ix' is 'QUIXOTE'.

'could' is the link.

Can you help me to learn more?

(Other definitions for quixote that I've seen before include "1 across --, knight-errant" , "12's Don" , "Foolish gentleman" , "Cervantes great creation Don . . . . . . ., man of La Mancha" , "Cervantes' hero" .)

I've seen this clue in The Irish Independent.

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