Overworked (5)
I believe the answer is:
trite
'overworked' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for trite that I've seen before include "Overfamiliar through overuse" , "all vigour is gone" , "Banal, commonplace" , "(Of an idea) lacking in originality" , "repeated too often" .)