Noble’s forte you heard as right (6)
I believe the answer is:
lordly
'noble's' is the definition.
(similar in meaning)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for lordly that I've seen before include "Haughty, lofty" , "Haughty - arrogant" , "Proud" , "Aristocratic" , "high-handed" .)