It's very fashionable is what I've just said (4,4)
I believe the answer is:
last word
I'm afraid I can't even guess how this answer relates to the clue.
Can you help me to learn more?
(Other definitions for last word that I've seen before include "this is finally put across" , "It's state-of-the-art" , "Amen" , "Final remark in argument" , "Most up-to-date - final decision" .)