Nautical greeting (4)
I believe the answer is:
ahoy
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nautical greeting</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ahoy that I've seen before include "A sailor's call to a ship" , "Hailing term at sea" , "Call for attention at sea" , "Sailor's shout to ship" , "What a sailor may" .)