Off course (6)
(Other definitions for adrift that I've seen before include "Unanchored - lost" , "Afloat without control" , "(Of ship) out of control" , "without guidance?" , "not settled" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">off course</span>' is the definition.<br/ ><span class="explanation-format__explanation">(to be led astray is to be led off course)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for astray that I've seen before include "Wandering off the track" , "Wandering off the path" , "Gone off the right path" , "on the wrong road" , "in the wrong place" .)