Flag down
I believe the answer is:
hail
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">flag down</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for hail that I've seen before include "An old Roman salute as to Caesar" , "Old Roman salute, or frozen pellets" , "Welcome - precipitation" , "Greet - bad weather" , "Call from a distance" .)