It's very fashionable is what I've just said (4,4)

I believe the answer is:

last word

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I'm afraid I can't explain this answer.

(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" .)

I've seen this clue in the Evening Standard.

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