King's boring flair for language (5)
I believe the answer is:
norse
'language' is the definition.
(Norse is an example)
'king's boring flair' is the wordplay.
'king's' becomes 'R's' (abbreviation for rex, king in Latin).
'boring' is an insertion indicator (some letters must 'bore' a hole into other letters).
'flair' becomes 'noe' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'rs' placed within 'noe' is 'NORSE'.
'for' is the link.
Can you help me to learn more?
(Other definitions for norse that I've seen before include "Of old Scandinavia" , "Relating to ancient Scandinavia" , "Family of Germanic languages spoken in Scandinavia and Iceland" , "Native to Norway" , "Old Scandinavian tongue" .)