Annoying — tedious (7)
I believe the answer is:
irksome
I believe this clue is a double definition.
'annoying' is the first definition.
(I've seen this before)
'tedious' is the second definition.
(I know that tedious can be written as irksome)
(Other definitions for irksome that I've seen before include "Annoying - tedious" , "'Tedious, tiresome (7)'" , "Troublesome, vexing" , "'Annoying, irritating or boring (7)'" , "Tiresome, irritating" .)