Harbor floaters
I believe the answer is:
buoys
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">harbor floaters</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 buoys that I've seen before include "Floating markers" , "Anchored floats" , "Coloured sea markers" , "Rises" .)