Aristocratic, but notable for being thankless? (5)

I believe the answer is:

noble

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

'aristocratic' is the definition.
(associated in meaning)

I don't understand the remainder of the clue.

(Other definitions for noble that I've seen before include "Worthy" , "Having high moral character" , "Of high rank or birth" , "Eminent" , "Grand, magnanimous" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app