Not at all interesting (8)
I believe the answer is:
tiresome
'not at all interesting' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for tiresome that I've seen before include "wearing" , "Boring, annoying" , "Tedious and boring" , "Is remote, being boring" , "'Tedious, irksome (8)'" .)