Attempting to be tedious (6)
I believe the answer is:
trying
'attempting' is the definition.
('try' can be a synonym of 'attempt')
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for trying that I've seen before include "responsibility of the first Baron Jeffreys of Wem" , "Tiresome" , "Attempting; difficult" , "activity in court?" , "Difficult - annoying" .)