Annoying, troublesome (6)
I believe the answer is:
trying
This clue is a double definition.
'annoying' is the first definition.
(I've seen this before)
'troublesome' is the second definition.
(I've seen this before)
(Other definitions for trying that I've seen before include "Difficult - annoying" , "Bothersome" , "Tiresome" , "Making attempts" , "Vexatious - having a go" .)