Fore's opposite (3)
I believe the answer is:
aft
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">fore's opposite</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 aft that I've seen before include "Sternward" , "near the tail" , "To the rear on board" , "Towards the back on board" , "At the back at sea" .)