Florentine farewell (4)
I believe the answer is:
ciao
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">florentine farewell</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ciao that I've seen before include "See you in Italy" , "Italian's so long" , "Italian cheerio" , "European's greeting" , "Italian hello or goodbye" .)