Cut short revolutionary phrase that's overused (6)
I believe the answer is:
cliche
'cut short revolutionary phrase' is the definition.
'cliche' can be an answer for 'phrase' (I have seen 'Stereotyped phrase' mean 'cliche' so perhaps 'phrase' could also mean 'cliche'). I am not certain of the 'cut short revolutionary' bit.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for cliche that I've seen before include "Jaded or well-worn expression" , "Nothing new in that, so to speak" , "Banal phrase" , "Saying made tedious through repetition" , "Trite or obvious remark" .)