Abaft (6)
I believe the answer is:
astern
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">abaft</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 astern that I've seen before include "Abaft" , "The wake is" , "Behind at sea" , "Nautically behind" , "Backward" .)