Fashionable slogan (8)
I believe the answer is:
buzzword
'fashionable slogan' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for buzzword that I've seen before include "Fashionable bit of jargon (for bees?)" , "Bit of jargon that's become fashionable to say" , "Bit of in-group jargon" , "Fashionable new term" , "Unit of speech in vogue" .)