Boring, tedious (8)
I believe the answer is:
tiresome
I believe this clue is a double definition.
'boring' is the first definition.
(I know that boring can be written as tiresome)
'tedious' is the second definition.
(I know that tedious can be written as tiresome)
(Other definitions for tiresome that I've seen before include "Is remote, being boring" , "Boring, annoying" , "Fatiguing; boring" , "Draggy - unamusing" , "Rather boring" .)