Subtlety is absent in bore? (6)
I believe the answer is:
nuance
'subtlety' is the definition.
(I know that subtlety can be written as nuance)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for nuance that I've seen before include "Delicate shade of meaning" , "Subtlety, nicety" , "Slight difference in meaning etc" , "Subtle difference of meaning" , "A slight shade or trace" .)