Sick of it (3,2)
I believe the answer is:
fed up
'sick of it' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for fed up that I've seen before include "as pigs are to be slaughtered?" , "far from happy?" , "Surfeited" , "Unhappy" , "Bored, browned off" .)