Overused expression (6)
I believe the answer is:
cliche
'overused expression' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cliche that I've seen before include "Platitude" , "Saying made tedious through repetition" , "Trite phrase" , "Hackneyed expression" , "Overused expression" .)