Guide; steer (5)
I believe the answer is:
pilot
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">guide</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(pilot can mean a navigator)</span><br/ ><br/ >'<span class="explanation-format__original">steer</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(piloting is a kind of steering)</span><br/ ><br/ ></span>
(Other definitions for pilot that I've seen before include "Flier or helmsman" , "Drive" , "This person can be found in a plane or a boat" , "may be up in the clouds" , "Captain of plane or boat" .)