Irritating type is missing subtle meaning (6)
I believe the answer is:
nuance
'subtle meaning' is the definition.
(I've seen this before)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for nuance that I've seen before include "Subtle variation, in meaning say" , "Fine shade of meaning" , "Ace nun (anag)" , "Delicate shade of meaning" , "Delicate shade of difference" .)